#interstellar objects

Astronomers studying the interstellar comet 3I/ATLAS say its water contains an unusually high concentration of deuterium, offering a rare look at how planetary systems may form in colder environments than our own.

Observations of interstellar comet 3I/ATLAS after perihelion found a lower carbon-dioxide-to-water ratio than earlier space-based observations suggested, pointing to changing coma chemistry and a more layered interior.

New ALMA observations found deuterated water in 3I/ATLAS, giving astronomers their first chemical read on an interstellar object’s birthplace and pointing to a colder, less irradiated environment than the early Solar Sys

The discovery of 3I/ATLAS, the third confirmed interstellar visitor, signals a revolution in astronomical survey capabilities rather than a sudden increase in cosmic visitors.