Evidence · 3I/ATLAS

Carbon isotopes date the ices to 10 to 12 billion years ago

The JWST team reads the high carbon-13 ratios as material accreted 10 to 12 billion years ago, before the Galaxy's carbon-13 had built up, an age estimate independent of the orbit.

Suggestive0

What it means

Key questionWhere in the Galaxy, and how long ago, did 3I/ATLAS form?

2 answers, none ahead yet

Openunchanged

Answer this evidence bears onAn old thick-disc body, older than the Sun

Supports2 for, none against

Still possibleunchanged

What it implies

Chemistry and kinematics agree on great age.For the key question: Where in the Galaxy, and how long ago, did 3I/ATLAS form?

Next steps 1

Repeat the stellar traceback with Gaia DR4

Could shiftFair odds~24 h

On: Where in the Galaxy, and how long ago, did 3I/ATLAS form?

9score

Details

When Gaia DR4 is released, rerun the backward integration with its larger catalogue and better velocities. A membership probability that moves decisively to thick or thin disc settles which answer leads; a home star within a few parsecs would be a first.

Ranked by how likely each is to move the key question, for the time it takes

Sources 2

Interstellar Comet 3I/ATLAS Has Cold, Ancient Origins

Telescope 2026

SRC

Isotopic Evidence for a Cold and Distant Origin of the Interstellar Object 3I/ATLAS

Cordiner et al. 2026

SRC

Cite it

Mysteries Department. (2026). Carbon isotopes date the ices to 10 to 12 billion years ago [Evidence EVD0DFQ52T02NDX]. https://mysteriesdept.com/r/EVD0DFQ52T02NDX

@misc{mysteriesdept_evd0dfq52t02ndx,
  title     = {Carbon isotopes date the ices to 10 to 12 billion years ago},
  author    = {{Mysteries Department}},
  year      = {2026},
  note      = {Evidence, catalog key EVD0DFQ52T02NDX},
  url       = {https://mysteriesdept.com/r/EVD0DFQ52T02NDX}
}