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Water Vapor Discovered in Interstellar Comet 3I/ATLAS

10/15/2025

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Summary

Story summary

Astronomers detected water vapor in comet 3I/ATLAS, the third confirmed interstellar object, using NASA's Neil Gehrels Swift Observatory.
Hydroxyl emissions indicate water presence far from the Sun, implying a production rate near 40 kilograms per second.
The rate differs from typical solar system comets, challenging models of comet behavior.
The study was published in The Astrophysical Journal Letters and could illuminate how comets and planetary systems form beyond our own.

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Story summary

Astronomers detected water vapor in comet 3I/ATLAS, the third confirmed interstellar object, using NASA's Neil Gehrels Swift Observatory.
Hydroxyl emissions indicate water presence far from the Sun, implying a production rate near 40 kilograms per second.
The rate differs from typical solar system comets, challenging models of comet behavior.
The study was published in The Astrophysical Journal Letters and could illuminate how comets and planetary systems form beyond our own.