SMRTR TechNov 4, 2025Live Science

'Interstellar visitor' 3I/ATLAS may have just changed color — for the third time

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Interstellar comet 3I/ATLAS unexpectedly brightened while passing behind the sun and may now appear blue, marking its third potential color change since July. The ancient comet previously showed red and green hues before reverting, with researchers attributing the shifting colors to different gases leaking from its surface.

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