JWST Observations of Interstellar Object 3I/ATLAS Reveal a High Methane D/H Ratio, Suggesting Formation in a Cold, Primitive Environment
To the point
Nathan X. Roth and colleagues report that the interstellar object 3I/ATLAS, observed by the James Webb Space Telescope, has an unusually high methane D/H ratio of about 3.3%, implying it formed in a cold, primitive environment very different from the Sun’s birthplace.
