SMRTR Science & EngineeringNov 19, 2025Ars Technica

NASA really wants you to know that 3I/ATLAS is an interstellar comet

SMRTR summary

NASA recently held a press conference to discuss findings about 3I/ATLAS, the third confirmed interstellar visitor and second interstellar comet detected by telescopes since July. The comet's highly eccentric orbit confirms its extrasolar origin, approaching from the galactic core direction before making its closest solar approach in October. Observations from multiple NASA missions, including Hubble and Mars-orbiting spacecraft, reveal it's a typical comet with some unusual characteristics, including higher carbon dioxide-to-water ratios and nickel enrichment compared to local comets.

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