Answer · 3I/ATLAS
More than 5 km across
The nucleus of 3I/ATLAS is more than 5 km across, a radius above 2.5 km.
Where it stands
DisputedA measurement falls outside the range it predicts: one piece of evidence for, two against. It needs two reviews to be accepted.
What it predicts
- No non-gravitational acceleration at the level of the mass loss
- A nucleus at least as bright as a 2.5-km body once the coma fades
What would rule it out
- A detected acceleration consistent with the mass loss of a kilometre-sized body
- A direct nucleus measurement below 2.5 km
Evidence 1 for · 2 against
No acceleration in the early arc
FORSpeculative
The missing acceleration turned up
AGAINSTSupported
AGAINST
The questions it answers
Open2 answers, none ahead
Cite it
Mysteries Department. (2026). More than 5 km across [Answer ANS0DFQ1P0P0QR0]. https://mysteriesdept.com/r/ANS0DFQ1P0P0QR0
@misc{mysteriesdept_ans0dfq1p0p0qr0,
title = {More than 5 km across},
author = {{Mysteries Department}},
year = {2026},
note = {Answer, catalog key ANS0DFQ1P0P0QR0},
url = {https://mysteriesdept.com/r/ANS0DFQ1P0P0QR0}
}