11/11/2025
On Oct 29, 2025, interstellar visitor 3I/ATLAS erupted in brightness at perihelion — a spike models didn’t predict.
Space observatories (SOHO, STEREO-A, GOES-19, Swift, JWST) saw blue emission bands, strong water signals, and almost no dust tail.
We break down possible causes — CO₂ “cooling cap” collapse, a radiation-hardened crust, or an unusual nucleus — and how to test each.
By the end you’ll know what to watch in Nov–Dec 2025, why open data matters, and which observations could confirm or overturn the mystery.