Astronomers using ALMA detected unprecedented levels of deuterated water in the interstellar comet 3I/ATLAS, revealing it contains 30 times more semi-heavy water than solar system comets.
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3I/ATLAS contains 30 times more semi-heavy water than comets in our solar system

30 Times Higher Than Solar System Comets Deuterated water abundance
ALMA (Atacama Large Millimeter/Submillimeter Array) Observation instrument
First Deuterated Water Measurement In Interstellar Comet Research milestone
First Of Its Kind In Interstellar Objects measurement milestone
30 Times Higher deuterated water ratio