3I/ATLASEvidence
Evidence · 3I/ATLAS
Water took over near perihelion; the ice band vanished
ESPRESSO spectra show the coma becoming water-dominated near perihelion, and SPHEREx in December 2025 found water emission forty times brighter and the water-ice absorption mostly gone.
What it means
Key questionWhy did 3I/ATLAS's activity and chemistry change so much across perihelion?
No answer ahead yet
Openunchanged
Answer this evidence bears onHeat reached deeper, water-richer layers and icy grains
Supports2 for, none against
Still possibleunchanged
What it implies
- Heating released water that was locked away inbound.For the key question: Why did 3I/ATLAS's activity and chemistry change so much across perihelion?
Sources 2
Cite it
Mysteries Department. (2026). Water took over near perihelion; the ice band vanished [Evidence EVD0DFQ54QY5WR5]. https://mysteriesdept.com/r/EVD0DFQ54QY5WR5
@misc{mysteriesdept_evd0dfq54qy5wr5,
title = {Water took over near perihelion; the ice band vanished},
author = {{Mysteries Department}},
year = {2026},
note = {Evidence, catalog key EVD0DFQ54QY5WR5},
url = {https://mysteriesdept.com/r/EVD0DFQ54QY5WR5}
}