SETI InstituteThe interstellar object 3I/ATLAS was discovered on July 1, 2025. There is currently no evidence to suggest that it is anything other than a natural astrophysical object. However, given the small number of such objects known (only three to date), and the plausibility of interstellar probes as a technosignature (a sign of extraterrestrial intelligence), a thorough study is warranted.
AlcorNewsLa comète 3I/Atlas passera près de la Terre le 19 déc 2025, messagère cosmique à ne pas manquer ! https://www.tameteo.com/actualites/astronomie/la-comete-3i-atlas-messagere-cosmique-effectuera-sa-plus-grande-approche-de-la-terre-le-19-decembre-2025-astronomie.html #Space #Science #Astrophysics #Comet3I #CelestialEvent #CosmosAlert
In our latest #SETILive #podcast, Franck asked Dr. Ariel Graykowski what it meant that an analysis of #Comet3I/ATLAS revealed a lack of water in the coma. Possibly, it meant that CO2 sublimation was cooling the local area around the nucleus and delaying water sublimation since water was detected as well. Listen to the full episode: https://feeds.libsyn.com/462636/rss
Westport ObservatoryWAS's Phil Harrington was up early this morning and captured our interstellar interloper, Comet 3I/ATLAS, with his Celestron Origin astrograph. A gorgeous look at a comet that keeps everyone guessing.
Curious about all the supposed “anomalies”? Astronomer Jason Wright breaks it down without the sci-fi spin:
https://sites.psu.edu/astrowright/2025/11/09/loebs-3i-atlas-anomalies-explained/
#Comet3I #ATLAS #InterstellarVisitor #Astrophotography #CelestronOrigin #WestportAstronomicalSociety #Astronomy
Next #SETILive: Comet 3I/ATLAS Perihelion Update
TODAY, 31 October, 1:00 pm PDT / 4:00 pm EDT
What happens when a visitor from another star system drops by? Join planetary astronomers Franck Marchis and Ariel Graykowski for a special SETI Live all about Comet 3I/ATLAS — only the third known interstellar object ever detected!
WATCH LIVE: https://youtube.com/live/zaVO-ufmgJg
Max Planck Institute for Solar System ResearchESA’s space probe #JUICE is headed towards a truly unexpected encounter: on November 2nd, observations of interstellar object #3I/ATLAS will begin. Read more about contributions from #mpsgoettingen to the campaign here: www.mps.mpg.de/juice-and-3i... #comet3i #comet3iatlas
JUICE and 3I/ATLAS: An Unexpec...
JUICE and 3I/ATLAS: An Unexpec...
JUICE and 3I/ATLAS: An Unexpected Encounter in Space
3I/ATLAS, the third known interstellar object to date, is currently traveling through the Solar System and reached its closest point to the Sun yesterday. In the next days, 3I/ATLAS is barely visible from Earth. ESA's spacecraft JUICE, however, is now launching a dedicated observation campaign. With the help of the JUICE’s scientific instruments, researchers at the Max Planck Institute for Solar System Research (MPS) hope to learn more about the water on 3I/ATLAS.
MPS GöttingenESA’s space probe #JUICE is headed towards a truly unexpected encounter: on November 2nd, observations of interstellar object #3IATLAS will begin. Read more about contributions from #mpsgoettingen to the campaign here: https://www.mps.mpg.de/juice-and-3iatlas-an-unexpected-encounter-in-space
JUICE and 3I/ATLAS: An Unexpected Encounter in Space
3I/ATLAS, the third known interstellar object to date, is currently traveling through the Solar System and reached its closest point to the Sun yesterday. In the next days, 3I/ATLAS is barely visible from Earth. ESA's spacecraft JUICE, however, is now launching a dedicated observation campaign. With the help of the JUICE’s scientific instruments, researchers at the Max Planck Institute for Solar System Research (MPS) hope to learn more about the water on 3I/ATLAS.
Steve Dustcircle 🌹#Interstellar Objects Like #Comet3I /ATLAS Could Act As #Planetary Seeds
Interstellar Objects Like Comet 3I/ATLAS Could Act As Planetary Seeds
ISOs like Comet 3I/ATLAS are fascinating yet fleeting visitors from distant solar systems. New research suggests that when captured by a young solar system that's still forming planets, these objects could act as planetary seeds for the formation of planets.
ケレムさん 🏴☠️ イラスト 
I was hopeful about 3I/ATLAS being something different. But I think it will turn out just another piece of rock or a ball of ice 😔
We’re not alone. What are we going to do about it?
This immersive “Situation Room” experience puts you at the table with scientists, strategists, and educators to debate humanity’s next move — in real time. As 3I/ATLAS or some other interstellar object approaches Earth, you decide: respond, retreat, or do nothing?
Vote for our #SXSW2026 panel: https://participate.sxsw.com/flow/sxsw/sxsw26/community-voting-sxsw/page/community-voting/session/1752013334355001BvhN