Anonymousabout 4 hours ago
Comet 3I/ATLAS, the third confirmed interstellar object to pass through our solar system, has been traced to a cold, isolated region of the Milky Way's thick disk, where it formed roughly 9.6 billion years ago — more than twice the age of our Sun. New ALMA observations published in Nature Astronomy reveal its water contains 30 times more deuterium than any solar system comet, providing the first direct chemical measurement of water from another planetary system and raising questions about the diversity of planet-forming environments across the galaxy.