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Alien Comet Holds Ancient Galactic Secrets
1 May
Summary
- Interstellar comet 3I/ATLAS contains over 40 times more deuterium than Earth's oceans.
- The comet likely formed in an extremely cold environment, below 30 Kelvin.
- Its composition offers clues to conditions in the Milky Way over 10 billion years ago.
Astronomers studying interstellar comet 3I/ATLAS have uncovered crucial details about its formation and the early conditions of our galaxy. Observations using the ALMA radio telescope in Chile detected a high abundance of deuterium in the comet's water, over 40 times that of Earth's oceans.
This enrichment suggests 3I/ATLAS originated in an extremely cold environment, below 30 Kelvin. Such conditions are linked to the formation of water in cold molecular clouds around the same time other solar systems emerged. The comet, estimated to be up to 11 billion years old, provides a unique 'time capsule' from an era preceding our own solar system.
Previous research indicating high levels of carbon dioxide within the comet aligns with the theory that it formed in the frigid outer regions of a protoplanetary disk. These findings contribute to understanding planetary system formation and the evolution of the Milky Way galaxy over cosmic timescales.
