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Mystery Deepens Around Third Interstellar Visitor 3I/ATLAS

  • Astronomers discovered the interstellar comet 3I/ATLAS passing through the Solar System in July 2025, with observations from telescopes including JWST and Hubble.
  • The comet's unusual composition and trajectory suggest it originated from the Milky Way's thick disk and may be about 7 billion years old, older than our Solar System.
  • Studies reveal 3I/ATLAS has a small nucleus under 5.5 kilometers, a large bright coma, and an exceptionally high carbon dioxide to water ratio in its coma.
  • The carbon dioxide to water ratio is roughly 8:1, sixteen times higher than typical Solar System comets, indicating the comet likely formed near a 'carbon dioxide ice line' in its original protoplanetary disk.
  • Ongoing observations with JWST and other instruments aim to study 3I/ATLAS further until it leaves the Solar System after October 2025, potentially revealing more about its origin.
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The interstellar object 3I/ATLAS, discovered in July of this year, provides headlines. Harvard astronomer Avi Loeb believes it is possible that there will be

·Berlin, Germany
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Zeit Online broke the news in Germany on Saturday, August 23, 2025.
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