Chemistry Reveals the Origins of an Interstellar Comet
Astronomers studying the interstellar comet 3I/ATLAS have identified unique chemical signatures in its coma that suggest it originated in a distant, ancient solar system. The high isotopic ratios of nitrogen and carbon indicate that the comet formed in a chemical environment significantly different from our own.
Somewhere in the Milky Way Galaxy is an old star that has lost one of its comets. By some quirk of orbital mechanics, that frozen nucleus of ice and dust got kicked out of its home system and into a long and winding trajectory across interstellar. It entered our Solar System sometime in the distant past and traveled somewhat near to Earth on October 30, 2025, on its way through the system. After its discovery in 2025, astronomers pointed telescopes at the interstellar visitor, named 3I/ATLAS (3I), to study the gases in its coma. What they've found so far points to a distant and very ancient origin for the comet.
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