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Browse all mystery articles about the interstellar visitor 3I/ATLAS

Mystery
The Green Glow That Shouldn't Exist: 3I/ATLAS Defies Comet Chemistry
New images reveal 3I/ATLAS glowing green despite lacking the molecules that typically cause this phenomenon in comets. This latest mystery adds another puzzle to our enigmatic interstellar visitor.
September 21, 2025
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Key Facts
Discovery Date
July 1st, 2025
Estimated Size
1 km diameter
Current Speed
N/A
Origin Direction
Constellation Sagittarius