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Daniel Pomarède<p>Comet’s Water Holds Clues to Life on Earth</p><p>New ALMA observations show water in Halley-type comet, 12P/Pons-Brooks, matches Earth’s oceans, strengthening the theory that comets helped make our planet habitable. </p><p><a href="https://public.nrao.edu/news/comets-water-holds-clues-to-life-on-earth/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">public.nrao.edu/news/comets-wa</span><span class="invisible">ter-holds-clues-to-life-on-earth/</span></a></p><p><a href="https://mastodon.social/tags/comet" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comet</span></a> <a href="https://mastodon.social/tags/comets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comets</span></a> <a href="https://mastodon.social/tags/chemistry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>chemistry</span></a> <a href="https://mastodon.social/tags/life" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>life</span></a> <a href="https://mastodon.social/tags/science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>science</span></a> <a href="https://mastodon.social/tags/news" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>news</span></a> <a href="https://mastodon.social/tags/ALMA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ALMA</span></a> <a href="https://mastodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a> <a href="https://mastodon.social/tags/astrodon" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astrodon</span></a> <a href="https://mastodon.social/tags/Earth" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Earth</span></a></p>
NASA<p>As NASA Missions Study Interstellar Comet, Hubble Makes Size Estimate <a href="https://science.nasa.gov/missions/hubble/as-nasa-missions-study-interstellar-comet-hubble-makes-size-estimate/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">science.nasa.gov/missions/hubb</span><span class="invisible">le/as-nasa-missions-study-interstellar-comet-hubble-makes-size-estimate/</span></a> <a href="https://social.beachcom.org/tags/NASA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NASA</span></a> <a href="https://social.beachcom.org/tags/Astrophysics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Astrophysics</span></a> <a href="https://social.beachcom.org/tags/AstrophysicsDivision" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>AstrophysicsDivision</span></a> <a href="https://social.beachcom.org/tags/Comets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Comets</span></a> <a href="https://social.beachcom.org/tags/GoddardSpaceFlightCenter" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>GoddardSpaceFlightCenter</span></a> <a href="https://social.beachcom.org/tags/HubbleSpaceTelescope" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HubbleSpaceTelescope</span></a> <a href="https://social.beachcom.org/tags/SmallBodiesOfTheSolarSystem" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>SmallBodiesOfTheSolarSystem</span></a> <a href="https://social.beachcom.org/tags/TheSolarSystem" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TheSolarSystem</span></a></p>
earthling<p>Hale-Bopp from Indian Cove - August 6th, 1997.</p><p>via livingforstars </p><p><a href="https://mastodon.social/tags/astrophotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astrophotography</span></a> <br><a href="https://mastodon.social/tags/comets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comets</span></a></p>
earthling<p>Cosmic messenger </p><p>Comet PanSTARRs </p><p>via the-wolf-and-moon </p><p><a href="https://mastodon.social/tags/astrophotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astrophotography</span></a> <br><a href="https://mastodon.social/tags/comets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comets</span></a></p>
Nikolas Kozloff<p>Doesn't sound like a scenario for a very <a href="https://federated.press/tags/romantic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>romantic</span></a> first date, as suggested by this <a href="https://federated.press/tags/Harvard" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Harvard</span></a> prof<br><a href="https://www.cbsnews.com/boston/news/harvard-scientist-comet-alien-craft-earth/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">cbsnews.com/boston/news/harvar</span><span class="invisible">d-scientist-comet-alien-craft-earth/</span></a> <a href="https://federated.press/tags/ufos" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ufos</span></a> <a href="https://federated.press/tags/ufo" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ufo</span></a> <a href="https://federated.press/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a> <a href="https://federated.press/tags/comet" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comet</span></a> <a href="https://federated.press/tags/comets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comets</span></a></p>
UK<p><a href="https://www.europesays.com/uk/298755/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="">europesays.com/uk/298755/</span><span class="invisible"></span></a> A Rare Interstellar Object Is Zipping Through Our Solar System. This Brand-New Telescope Saw It First <a href="https://pubeurope.com/tags/Asteroids" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Asteroids</span></a> <a href="https://pubeurope.com/tags/Astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Astronomy</span></a> <a href="https://pubeurope.com/tags/comets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comets</span></a> <a href="https://pubeurope.com/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Science</span></a> <a href="https://pubeurope.com/tags/UK" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>UK</span></a> <a href="https://pubeurope.com/tags/UnitedKingdom" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>UnitedKingdom</span></a></p>
Canada News Beep<p>Astronomers witness newborn planet sculpting the dust around it</p><p>Press Release 21 July 2025 Astronomers may have caught a still-forming planet in action, carving out an intricate…<br><a href="https://newsbeep.org/tags/NewsBeep" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NewsBeep</span></a> <a href="https://newsbeep.org/tags/News" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>News</span></a> <a href="https://newsbeep.org/tags/Space" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Space</span></a> <a href="https://newsbeep.org/tags/ALMA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ALMA</span></a> <a href="https://newsbeep.org/tags/Astronomie" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Astronomie</span></a> <a href="https://newsbeep.org/tags/Astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Astronomy</span></a> <a href="https://newsbeep.org/tags/Astrophysics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Astrophysics</span></a> <a href="https://newsbeep.org/tags/CA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>CA</span></a> <a href="https://newsbeep.org/tags/Canada" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Canada</span></a> <a href="https://newsbeep.org/tags/Chile" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Chile</span></a> <a href="https://newsbeep.org/tags/comets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comets</span></a> <a href="https://newsbeep.org/tags/detectors" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>detectors</span></a> <a href="https://newsbeep.org/tags/ELT" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ELT</span></a> <a href="https://newsbeep.org/tags/ESO" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ESO</span></a> <a href="https://newsbeep.org/tags/eso" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>eso</span></a>.org <a href="https://newsbeep.org/tags/galaxies" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>galaxies</span></a> <a href="https://newsbeep.org/tags/Garching" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Garching</span></a> <a href="https://newsbeep.org/tags/LaSilla" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>LaSilla</span></a> <a href="https://newsbeep.org/tags/nebulae" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>nebulae</span></a> <a href="https://newsbeep.org/tags/NTT" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTT</span></a> <a href="https://newsbeep.org/tags/Paranal" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Paranal</span></a> <a href="https://newsbeep.org/tags/Planets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Planets</span></a> <a href="https://newsbeep.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Science</span></a> <a href="https://newsbeep.org/tags/Stars" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Stars</span></a> <a href="https://newsbeep.org/tags/Suedsternwarte" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Suedsternwarte</span></a> <a href="https://newsbeep.org/tags/telescopes" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>telescopes</span></a> <a href="https://newsbeep.org/tags/universe" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>universe</span></a> <a href="https://newsbeep.org/tags/VLT" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>VLT</span></a> <a href="https://newsbeep.org/tags/VLTI" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>VLTI</span></a><br><a href="https://www.newsbeep.com/ca/13592/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="">newsbeep.com/ca/13592/</span><span class="invisible"></span></a></p>
Jack C.M<p>Fuzzy, Large, And Very Old: Everything We Know About Interstellar Comet 3I/ATLAS. Via @sciencealert <a class="hashtag" rel="nofollow noopener" href="https://bsky.app/search?q=%23Space" target="_blank">#Space</a> <a class="hashtag" rel="nofollow noopener" href="https://bsky.app/search?q=%23Astrophysics" target="_blank">#Astrophysics</a> <a class="hashtag" rel="nofollow noopener" href="https://bsky.app/search?q=%23OrbitalMechanics" target="_blank">#OrbitalMechanics</a> <a class="hashtag" rel="nofollow noopener" href="https://bsky.app/search?q=%23Astronomy" target="_blank">#Astronomy</a> 🚀 🌌 ☄️ 🛰️ <a class="hashtag" rel="nofollow noopener" href="https://bsky.app/search?q=%233IATLAS" target="_blank">#3IATLAS</a> <a class="hashtag" rel="nofollow noopener" href="https://bsky.app/search?q=%23Comet" target="_blank">#Comet</a> <a class="hashtag" rel="nofollow noopener" href="https://bsky.app/search?q=%23Comets" target="_blank">#Comets</a><br><br><a href="https://www.sciencealert.com/fuzzy-large-and-very-old-everything-we-know-about-interstellar-comet-3i-atlas" rel="nofollow noopener" target="_blank">Fuzzy, Large, And Very Old: Ev...</a></p>
grobi<p>June 5, 2025</p><p>by Molly Wasser</p><p>NASA’s Webb Observations Update Asteroid 2024 YR4’s Lunar Impact Odds</p><p>While asteroid 2024 YR4 is currently too distant to detect with telescopes from Earth, NASA’s James Webb Space Telescope collected one more observation of the asteroid before it escaped from view in its orbit around the Sun. </p><p>With the additional data, experts from NASA’s Center for Near-Earth Object Studies at the agency’s Jet Propulsion Laboratory in Southern California further refined the asteroid’s orbit. The Webb data improved our knowledge of where the asteroid will be on Dec. 22, 2032, by nearly 20%. As a result, the asteroid’s probability of impacting the Moon has slightly increased from 3.8% to 4.3%. In the small chance that the asteroid were to impact, it would not alter the Moon’s orbit. </p><p>When asteroid 2024 YR4 was first discovered, the asteroid had a small chance of impacting Earth. After more observations, NASA concluded the object poses no significant impact risk to Earth in 2032 and beyond. </p><p>As data comes in, it is normal for the impact probability to evolve. An international team led by Dr. Andy Rivkin from the Johns Hopkins Applied Physics Laboratory in Laurel, Maryland, made the observations using Webb’s Near-Infrared Camera in May. </p><p>Asteroid 2024 YR4 is now too far away to observe with either space or ground-based telescopes. NASA expects to make further observations when the asteroid’s orbit around the Sun brings it back into the vicinity of Earth in 2028.   </p><p>CREDIT<br>NASA/JPL Center for Near-Earth Object Studies</p><p><a href="https://defcon.social/tags/comets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comets</span></a> <a href="https://defcon.social/tags/astrophotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astrophotography</span></a> <a href="https://defcon.social/tags/photography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>photography</span></a> <a href="https://defcon.social/tags/science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>science</span></a> <a href="https://defcon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a> <a href="https://defcon.social/tags/tech" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>tech</span></a> <a href="https://defcon.social/tags/security" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>security</span></a> <a href="https://defcon.social/tags/defense" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>defense</span></a> <a href="https://defcon.social/tags/NASA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NASA</span></a> <a href="https://defcon.social/tags/ESA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ESA</span></a></p>
grobi<p>Near-Earth Asteroids as of July 2025<br>The headshot image of NASA Science Editorial Team<br>NASA Science Editorial Team<br>Jul 02, 2025</p><p>Each month, NASA’s Planetary Defense Coordination Office releases a monthly update featuring the most recent figures on NASA’s planetary defense efforts, near-Earth object close approaches, and other timely facts about comets and asteroids that could pose an impact hazard with Earth. Here is what we've found so far:</p><p> <br>38,612: Total number of discovered near-Earth asteroids of all sizes. </p><p>872: Discovered asteroids larger than 1 kilometer, with an estimated 50 left to be found. </p><p>11,324: Discovered asteroids larger than 140 meters, with an estimated 14,000 remaining to be found.</p><p>100 Tons amount of dust and sand-sized particles that bombard Earth daily. </p><p>Near-Earth asteroid close approaches: <br>7 passed closer to Earth than the Moon in the last 30 days. 164 passed closer in the last 365 days. 493,300,000: Observations of near-Earth objects submitted to the Minor Planet Center.<br>Updated: July 2, 2025</p><p><a href="https://science.nasa.gov/science-research/planetary-science/planetary-defense/near-earth-asteroids/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">science.nasa.gov/science-resea</span><span class="invisible">rch/planetary-science/planetary-defense/near-earth-asteroids/</span></a></p><p><a href="https://defcon.social/tags/comets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comets</span></a> <a href="https://defcon.social/tags/astrophotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astrophotography</span></a> <a href="https://defcon.social/tags/photography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>photography</span></a> <a href="https://defcon.social/tags/science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>science</span></a> <a href="https://defcon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a> <a href="https://defcon.social/tags/tech" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>tech</span></a> <a href="https://defcon.social/tags/security" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>security</span></a> <a href="https://defcon.social/tags/defense" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>defense</span></a> <a href="https://defcon.social/tags/NASA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NASA</span></a> <a href="https://defcon.social/tags/ESA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ESA</span></a></p>
grobi<p>Planetary Defense at NASA</p><p>In 2016, NASA established the Planetary Defense Coordination Office (PDCO) to manage the agency's ongoing mission of finding, tracking, and better understanding asteroids and comets that could pose an impact hazard to Earth. Here you can stay informed about the PDCO, NASA's Near-Earth Object (NEO) Observations Program, and upcoming planetary defense flight missions, including NASA'S NEO Surveyor mission.</p><p>Planetary Defenders</p><p>NASA’s Planetary Defenders is a gripping documentary that delves into the high-stakes world of asteroid detection and planetary defense by journeying alongside NASA’s dedicated team of scientists, astronomers, and engineers who discover, track, and monitor near-Earth asteroids to safeguard Earth from potential impacts. Available now on NASA+ and other streaming platforms.</p><p>How would humanity respond if we discovered an asteroid headed for Earth? NASA’s "Planetary Defenders" is a gripping documentary that delves into the high-stakes world of asteroid detection and planetary defense.</p><p><a href="https://science.nasa.gov/blogs/planetary-defense/2025/07/02/nasa-discovers-interstellar-comet-moving-through-solar-system/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">science.nasa.gov/blogs/planeta</span><span class="invisible">ry-defense/2025/07/02/nasa-discovers-interstellar-comet-moving-through-solar-system/</span></a></p><p><a href="https://defcon.social/tags/comets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comets</span></a> <a href="https://defcon.social/tags/astrophotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astrophotography</span></a> <a href="https://defcon.social/tags/photography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>photography</span></a> <a href="https://defcon.social/tags/science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>science</span></a> <a href="https://defcon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a> <a href="https://defcon.social/tags/tech" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>tech</span></a> <a href="https://defcon.social/tags/security" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>security</span></a> <a href="https://defcon.social/tags/defense" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>defense</span></a> <a href="https://defcon.social/tags/NASA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NASA</span></a> <a href="https://defcon.social/tags/ESA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ESA</span></a></p>
grobi<p>TOPIC&gt; Interstellar Visitors !&gt;NEWS</p><p>2025 July 17</p><p>3I/ATLAS<br> * Image Credit: Gemini Observatory/NOIRLab/NSF/AURA/K. Meech (IfA/U. Hawaii)<br> * Processing: Jen Miller, Mahdi Zamani (NSF/NOIRLab)<br><a href="https://noirlab.edu/public/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">noirlab.edu/public/</span><span class="invisible"></span></a></p><p>Explanation: <br>Discovered on July 1 with the NASA-funded ATLAS (Asteroid Terrestrial-impact Last Alert, System) survey telescope in Rio Hurtado, Chile, 3I/ATLAS is so designated as the third known interstellar object to pass through our Solar System It follows 1I/ʻOumuamua in 2017 and the comet 2I/Borisov in 2019. Also known as C/2025 N1, 3I/ATLAS is clearly a comet, its diffuse cometary coma, a cloud of gas and dust surrounding an icy nucleus, is easily seen in these images from the large Gemini North telescope on Maunakea, Hawai‘i. The left panel tracks the comet as it moves across the sky against fixed background stars in successive exposures. Three different filters were used, shown in red, green, and blue. In the right panel the multiple exposures are registered and combined to form a single image of the comet. The comet's interstellar origin is also clear from its orbit, determined to be an eccentric, highly hyperbolic orbit that does not loop back around the Sun and will return 3I/ATLAS to interstellar space. Not a threat to planet Earth, the inbound interstellar interloper is now within the Jupiter's orbital distance of the Sun, while its closest approach to the Sun will bring it just within the orbital distance of Mars.<br><a href="https://noirlab.edu/public/news/noirlab2522/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">noirlab.edu/public/news/noirla</span><span class="invisible">b2522/</span></a> <br><a href="https://minorplanetcenter.net/mpec/K25/K25N12.html" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">minorplanetcenter.net/mpec/K25</span><span class="invisible">/K25N12.html</span></a><br><a href="https://science.nasa.gov/blogs/planetary-defense/2025/07/02/nasa-discovers-interstellar-comet-moving-through-solar-system/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">science.nasa.gov/blogs/planeta</span><span class="invisible">ry-defense/2025/07/02/nasa-discovers-interstellar-comet-moving-through-solar-system/</span></a><br><a href="https://apod.nasa.gov/apod/ap250707.html" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">apod.nasa.gov/apod/ap250707.ht</span><span class="invisible">ml</span></a><br><a href="https://en.wikipedia.org/wiki/3I/ATLAS" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">en.wikipedia.org/wiki/3I/ATLAS</span><span class="invisible"></span></a></p><p><a href="https://apod.nasa.gov/apod/ap250717.html" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">apod.nasa.gov/apod/ap250717.ht</span><span class="invisible">ml</span></a></p><p><a href="https://defcon.social/tags/comets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comets</span></a> <a href="https://defcon.social/tags/astrophotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astrophotography</span></a> <a href="https://defcon.social/tags/photography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>photography</span></a> <a href="https://defcon.social/tags/science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>science</span></a> <a href="https://defcon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a> <a href="https://defcon.social/tags/nature" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>nature</span></a> <a href="https://defcon.social/tags/NASA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NASA</span></a> <a href="https://defcon.social/tags/ESA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ESA</span></a> <a href="https://defcon.social/tags/news" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>news</span></a></p>
US<p><a href="https://www.europesays.com/us/67978/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="">europesays.com/us/67978/</span><span class="invisible"></span></a> For the first time, astronomers witness the dawn of a new solar system <a href="https://pubeurope.com/tags/ALMA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ALMA</span></a> <a href="https://pubeurope.com/tags/Astronomie" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Astronomie</span></a> <a href="https://pubeurope.com/tags/Astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Astronomy</span></a> <a href="https://pubeurope.com/tags/Astrophysics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Astrophysics</span></a> <a href="https://pubeurope.com/tags/Chile" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Chile</span></a> <a href="https://pubeurope.com/tags/comets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comets</span></a> <a href="https://pubeurope.com/tags/detectors" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>detectors</span></a> <a href="https://pubeurope.com/tags/ELT" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ELT</span></a> <a href="https://pubeurope.com/tags/ESO" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ESO</span></a> <a href="https://pubeurope.com/tags/eso" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>eso</span></a>.org <a href="https://pubeurope.com/tags/galaxies" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>galaxies</span></a> <a href="https://pubeurope.com/tags/Garching" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Garching</span></a> <a href="https://pubeurope.com/tags/LaSilla" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>LaSilla</span></a> <a href="https://pubeurope.com/tags/nebulae" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>nebulae</span></a> <a href="https://pubeurope.com/tags/NTT" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTT</span></a> <a href="https://pubeurope.com/tags/Paranal" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Paranal</span></a> <a href="https://pubeurope.com/tags/Planets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Planets</span></a> <a href="https://pubeurope.com/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Science</span></a> <a href="https://pubeurope.com/tags/Space" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Space</span></a> <a href="https://pubeurope.com/tags/stars" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>stars</span></a> <a href="https://pubeurope.com/tags/Suedsternwarte" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Suedsternwarte</span></a> <a href="https://pubeurope.com/tags/telescopes" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>telescopes</span></a> <a href="https://pubeurope.com/tags/UnitedStates" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>UnitedStates</span></a> <a href="https://pubeurope.com/tags/UnitedStates" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>UnitedStates</span></a> <a href="https://pubeurope.com/tags/universe" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>universe</span></a> <a href="https://pubeurope.com/tags/US" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>US</span></a> <a href="https://pubeurope.com/tags/VLT" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>VLT</span></a> <a href="https://pubeurope.com/tags/VLTI" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>VLTI</span></a></p>
earthling<p>"Close-up of a Comet" by Gerald Rhemann and Michael Jäger </p><p><a href="https://mastodon.social/tags/astrophotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astrophotography</span></a> <br><a href="https://mastodon.social/tags/comets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comets</span></a></p>
grobi<p>As seen from Earth, the comet was in the northern sky from September until mid-November. It crossed the ecliptic plane on 26 October near the star Regulus, and the celestial equator on 13 November 2019, entering the southern sky. On 8 December 2019, the comet reached perihelion (closest approach to the Sun) and was near the inner edge of the asteroid belt. In late December, it made its closest approach to Earth, 1.9 au, and had a solar elongation of about 80°. Due to its 44° orbital inclination, 2I/Borisov did not make any notable close approaches to the planets. 2I/Borisov entered the Solar System from the direction of Cassiopeia near the border with Perseus. This direction indicates that it originates from the galactic plane, rather than from the galactic halo. It will leave the Solar System in the direction of Telescopium. In interstellar <a href="https://defcon.social/tags/space" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>space</span></a>, 2I/Borisov takes roughly 9000 years to travel a light-year relative to the Sun</p><p>2I/Borisov's trajectory is extremely hyperbolic, having an orbital eccentricity of 3.36. This is much higher than the 300+ known weakly hyperbolic comets, with heliocentric eccentricities just over 1, and even ʻOumuamua with an eccentricity of 1.2.<br>2I/Borisov also has a hyperbolic excess velocity ( v ∞ {\displaystyle v_{\infty }}) of 32 km/s, much higher than what could be explained by perturbations, which could produce velocities when approaching an infinite distance from the Sun of less than a few km/s. These two parameters are important indicators of 2I/Borisov's interstellar origin. For comparison, the Voyager 1 spacecraft, which is leaving the Solar System, is traveling at 16.9 km/s (3.57 AU/a). 2I/Borisov has a much larger eccentricity than ʻOumuamua due to its higher excess velocity and its significantly higher perihelion distance. At this larger distance, the Sun's gravity is less able to alter its path as it passes through the Solar System.</p><p>From Wikipedia</p><p><a href="https://defcon.social/tags/comets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comets</span></a> <a href="https://defcon.social/tags/astrophotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astrophotography</span></a> <a href="https://defcon.social/tags/photography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>photography</span></a> <a href="https://defcon.social/tags/science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>science</span></a> <a href="https://defcon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a> <a href="https://defcon.social/tags/nature" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>nature</span></a> <a href="https://defcon.social/tags/NASA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NASA</span></a> <a href="https://defcon.social/tags/ESA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ESA</span></a></p>
grobi<p>From Wikipedia, the free encyclopedia</p><p>2I/Borisov</p><p>2I/Borisov, originally designated C/2019 Q4 (Borisov), is the first observed rogue comet and the second observed interstellar interloper after ʻOumuamua. It was discovered by the Crimean amateur astronomer and telescope maker Gennadiy Borisov on 29 August 2019 UTC (30 August local time).</p><p>2I/Borisov has a heliocentric orbital eccentricity of 3.36 and is not bound to the Sun. The comet passed through the ecliptic of the Solar System at the end of October 2019, and made its closest approach to the Sun at just over 2 AU on 8 December 2019. The comet passed closest to Earth on 28 December 2019.</p><p>In November 2019, astronomers from Yale University said that the comet's tail was 14 times the size of Earth, and stated, "It's humbling to realize how small Earth is next to this visitor from another solar system."</p><p>The comet is formally called "2I/Borisov" by the International Astronomical Union (IAU), with "2I" or "2I/2019 Q4" being its designation and "Borisov" being its name, but is sometimes referred to as "Comet Borisov", especially in the popular press. As the second observed interstellar interloper after 1I/ʻOumuamua, it was given the "2I" designation, where "I" stands for interstellar. The name Borisov follows the tradition of naming comets after their discoverers. Before final designation as 2I/Borisov, the object was referred to by other names: <br>gb00234<br>C/2019 Q4 </p><p><a href="https://en.wikipedia.org/wiki/2I/Borisov#Nomenclature" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">en.wikipedia.org/wiki/2I/Boris</span><span class="invisible">ov#Nomenclature</span></a></p><p><a href="https://defcon.social/tags/space" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>space</span></a> <a href="https://defcon.social/tags/comets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comets</span></a> <a href="https://defcon.social/tags/astrophotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astrophotography</span></a> <a href="https://defcon.social/tags/photography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>photography</span></a> <a href="https://defcon.social/tags/science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>science</span></a> <a href="https://defcon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a> <a href="https://defcon.social/tags/nature" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>nature</span></a> <a href="https://defcon.social/tags/NASA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NASA</span></a> <a href="https://defcon.social/tags/ESA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ESA</span></a></p>
grobi<p>From Contributors to Wikimedia projects</p><p>1I/ʻOumuamua<br> <br>is the first confirmed interstellar object detected passing through the Solar System. Formally designated 1I/2017 U1, it was discovered by Robert Weryk using the Pan-STARRS telescope at Haleakalā Observatory, Hawaii, on 19 October 2017, approximately 40 days after it passed its closest point to the Sun on 9 September. When it was first observed, it was about 33 million km (21 million mi; 0.22 AU) from Earth (about 85 times as far away as the Moon) and already heading away from the Sun.</p><p>ʻOumuamua is a small object estimated to be between 100 and 1,000 metres (328 and 3,280 ft) long, with its width and thickness both estimated between 35 and 167 metres (115 and 548 ft). It has a red color, like objects in the outer Solar System. Despite its close approach to the Sun, it showed no signs of having a coma, the usual nebula around comets formed when they pass near the Sun. Further, it exhibited non‑gravitational acceleration, potentially due to outgassing or a push from solar radiation pressure.<br>It has a rotation rate similar to the Solar System's asteroids, but many valid models permit it to be unusually more elongated than all but a few other natural bodies observed in the solar system. This feature raised speculation about its origin. Its light curve, assuming little systematic error, presents its motion as "tumbling" rather than "spinning", and moving sufficiently fast relative to the Sun that it is likely of extrasolar origin. Extrapolated and without further deceleration, its path cannot be captured into a solar orbit, so it will eventually leave the Solar System and continue into interstellar space. Its planetary system of origin and age are unknown. [...]</p><p><a href="https://en.wikipedia.org/wiki/1I/%CA%BBOumuamua" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">en.wikipedia.org/wiki/1I/%CA%B</span><span class="invisible">BOumuamua</span></a></p><p>Image Credit:<br>By Tomruen <a href="https://commons.wikimedia.org/w/index.php?curid=64846159" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">commons.wikimedia.org/w/index.</span><span class="invisible">php?curid=64846159</span></a></p><p><a href="https://defcon.social/tags/space" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>space</span></a> <a href="https://defcon.social/tags/comets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comets</span></a> <a href="https://defcon.social/tags/astrophotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astrophotography</span></a> <a href="https://defcon.social/tags/photography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>photography</span></a> <a href="https://defcon.social/tags/science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>science</span></a> <a href="https://defcon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a> <a href="https://defcon.social/tags/nature" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>nature</span></a> <a href="https://defcon.social/tags/NASA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NASA</span></a> <a href="https://defcon.social/tags/ESA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ESA</span></a></p>
grobi<p>Four Years Of Nasa Neowise Data</p><p>NASA's Near-Earth Object Wide-field Infrared Survey Explorer (NEOWISE) mission has released its fourth year of survey data. Since the mission was restarted in December 2013, after a period of hibernation, the asteroid- and comet-hunter has completely scanned the skies nearly eight times and has observed and characterized 29,375 objects in four years of operations. This total includes 788 near-Earth objects and 136 comets since the mission restart.</p><p>Near-Earth objects (NEOs) are comets and asteroids that have been nudged by the gravitational attraction of the planets in our solar system into orbits that allow them to enter Earth's neighborhood. Ten of the objects discovered by NEOWISE in the past year have been classified as potentially hazardous asteroids (PHAs). Near-Earth objects are classified as PHAs, based on their size and how closely they can approach Earth's orbit.</p><p>"NEOWISE continues to expand our catalog and knowledge of these elusive and important objects," said Amy Mainzer, NEOWISE principal investigator from NASA's Jet Propulsion Laboratory in Pasadena, California. "In total, NEOWISE has now characterized sizes and reflectivities of over 1,300 near-Earth objects since the spacecraft was launched, offering an invaluable resource for understanding the physical properties of this population, and studying what they are made of and where they have come from."</p><p>[...]</p><p>More than 2.5 million infrared images of the sky were collected in the fourth year of operations by NEOWISE. These data are combined with the year one through three NEOWISE data into a single publicly available archive. That archive contains approximately 10.3 million sets of images and a database of more than 76 billion source detections extracted from those images.</p><p><a href="https://www.jpl.nasa.gov/news/four-years-of-nasa-neowise-data/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">jpl.nasa.gov/news/four-years-o</span><span class="invisible">f-nasa-neowise-data/</span></a></p><p>CREDIT<br>Jet Propulsion Laboratory</p><p><a href="https://defcon.social/tags/space" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>space</span></a> <a href="https://defcon.social/tags/comets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comets</span></a> <a href="https://defcon.social/tags/astrophotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astrophotography</span></a> <a href="https://defcon.social/tags/photography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>photography</span></a> <a href="https://defcon.social/tags/science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>science</span></a> <a href="https://defcon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a> <a href="https://defcon.social/tags/nature" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>nature</span></a> <a href="https://defcon.social/tags/NASA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NASA</span></a> <a href="https://defcon.social/tags/ESA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ESA</span></a></p>
grobi<p>June 30, 2017</p><p>NASA Planetary Defense:<br>Backyard Asteroid Observer</p><p>Backyard astronomer Robert Holmes of Westfield, Illinois, is part of NASA's army of observers scanning the night sky for asteroids.</p><p>"We do follow-up observations with NASA's near-Earth observations program. All night long, I'm running big telescopes. One's a 24-inch, a 30-inch, and a 32-inch. And then the 50 inch is my… my biggest telescope [...]."</p><p>"[...] We do follow-up observations for the discoveries that are made by the large sky surveys. By looking at these asteroids, and measuring these asteroids, we can determine what their possibilities of actually hitting the Earth in the future are going to be.</p><p>NASA provides coordinates of specific objects that they need observations on. I'm gonna punch in the coordinates here, and I'm doing this remotely from inside a control room, not at the telescope. And so, we look these objects up and then use those coordinates to look at a tiny piece of the sky that this object happens to be in. And then we follow those objects, and define and refine orbits for those objects, and reduce the uncertainty of where it's going to go in the near future.</p><p>I started off as a volunteer in 2006. It's just blossomed into a full-time opportunity to work for NASA under their grant program, where I'm now doing this every single clear night.</p><p>Now we're starting the observing run for 2017 KK3. You don't build a telescope that's this big without having… being passionate about what you do. I'm really driven to be a part of a program that's important and has importance to the future. And we're not talking about next year or the year after, We're talking about asteroids that could potentially hit the Earth 100 years from now. And the work we do today may make a difference 100 years from now."</p><p><a href="https://www.jpl.nasa.gov/videos/nasa-planetary-defense-backyard-asteroid-observer/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">jpl.nasa.gov/videos/nasa-plane</span><span class="invisible">tary-defense-backyard-asteroid-observer/</span></a></p><p>FYI:<br><a href="https://science.nasa.gov/planetary-defense/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">science.nasa.gov/planetary-def</span><span class="invisible">ense/</span></a></p><p>CREDIT<br>Jet Propulsion Laboratory</p><p><a href="https://defcon.social/tags/space" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>space</span></a> <a href="https://defcon.social/tags/comets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comets</span></a> <a href="https://defcon.social/tags/astrophotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astrophotography</span></a> <a href="https://defcon.social/tags/photography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>photography</span></a> <a href="https://defcon.social/tags/science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>science</span></a> <a href="https://defcon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a> <a href="https://defcon.social/tags/nature" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>nature</span></a> <a href="https://defcon.social/tags/NASA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NASA</span></a> <a href="https://defcon.social/tags/ESA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ESA</span></a> <a href="https://defcon.social/tags/security" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>security</span></a> <a href="https://defcon.social/tags/tech" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>tech</span></a></p>
grobi<p>Nov. 20, 2017</p><p>Solar Systems First Interstellar Visitor Dazzles Scientists </p><p>Astronomers scrambled to observe an intriguing asteroid that zipped through the solar system on a steep trajectory from interstellar space-the first confirmed object from another star.</p><p>Now, new data reveal the interstellar interloper to be a rocky, cigar-shaped object with a somewhat reddish hue. The asteroid, named 'Oumuamua by its discoverers, is up to one-quarter mile (400 meters) long and highly-elongated-perhaps 10 times as long as it is wide. That aspect ratio is greater than that of any asteroid or comet observed in our solar system to date. While its elongated shape is quite surprising, and unlike asteroids seen in our solar system, it may provide new clues into how other solar systems formed.</p><p>The observations and analyses were funded in part by NASA and appear in the Nov. 20 issue of the journal Nature. They suggest this unusual object had been wandering through the Milky Way, unattached to any star system, for hundreds of millions of years before its chance encounter with our star system.</p><p>"For decades we've theorized that such interstellar objects are out there, and now - for the first time - we have direct evidence they exist," said Thomas Zurbuchen, associate administrator for NASA's Science Mission Directorate in Washington. "This history-making discovery is opening a new window to study formation of solar systems beyond our own."</p><p>Immediately after its discovery, telescopes around the world, including ESO's Very Large Telescope in Chile, were called into action to measure the object's orbit, brightness and color. Urgency for viewing from ground-based telescopes was vital to get the best data.</p><p>Combining the images from the FORS instrument on the ESO telescope using four different [...]</p><p><a href="https://www.jpl.nasa.gov/news/solar-systems-first-interstellar-visitor-dazzles-scientists/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">jpl.nasa.gov/news/solar-system</span><span class="invisible">s-first-interstellar-visitor-dazzles-scientists/</span></a></p><p>CREDIT<br>Jet Propulsion Laboratory</p><p><a href="https://defcon.social/tags/space" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>space</span></a> <a href="https://defcon.social/tags/comets" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>comets</span></a> <a href="https://defcon.social/tags/astrophotography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astrophotography</span></a> <a href="https://defcon.social/tags/photography" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>photography</span></a> <a href="https://defcon.social/tags/science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>science</span></a> <a href="https://defcon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a> <a href="https://defcon.social/tags/nature" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>nature</span></a> <a href="https://defcon.social/tags/NASA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NASA</span></a> <a href="https://defcon.social/tags/ESA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ESA</span></a></p>