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'Interstellar Visitor' 3I/ATLAS May Have Just Changed Color — for the Third Time

The comet 3I/ATLAS brightened beyond expectations and shows non-gravitational acceleration likely caused by volatile gas outgassing, with three color changes observed since July 2025.

Summary by Live Science
Recent observations of the interstellar object 3I/ATLAS show that it has developed a faint blueish hue, hinting at a potential color change. This is the third time experts have seen the comet's coloring shift since it was discovered.

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The renowned comet 3I/Atlas has surprised researchers who closely follow him in his trajectory through space. This time his coloration is what attracts attention.

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IFLScience broke the news on Tuesday, November 4, 2025.
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