Comet 31/ATLAS could be nuclear-powered, Harvard scientist says

NOW PLAYING

Want to see more of NewsNation? Get 24/7 fact-based news coverage with the NewsNation app or add NewsNation as a preferred source on Google!

(NewsNation) — The Harvard scientist raising concerns about incoming comet 3I/ATLAS — namely, that it could be some kind of alien probe sent to study our solar system — is now saying the interstellar object may be nuclear-powered.

Avi Loeb said he bases this hypothesis on a July 21 image captured by the Hubble Space Telescope and shared by NASA. He said the image shows a glow on the front end of 3I/ATLAS, as if it is emitting light.  

31/ATLAS could be alien tech: Avi Loeb

For various reasons, Loeb rules out the possibility that this glow is attributable to reflected sunlight or rare interstellar nuclear material. Instead, he is zeroing in on his previous suggestion that 3I/ATLAS may be alien tech.

“ … 3I/ATLAS could be a spacecraft powered by nuclear energy, and the dust emitted from its frontal surface might be from dirt that accumulated on its surface during its interstellar travel. This cannot be ruled out, but requires better evidence to be viable,” the theoretical physicist said in a recent blog post.

Appearing Wednesday on “Elizabeth Vargas Reports,” Loeb again noted the unusually precise trajectory of 3I/ATLAS, which will get relatively close to Mars, Venus and Jupiter.

31/ATLAS doesn’t look like ‘a random occurrence’: Harvard scientist

“The timing of its arrival is perfect for that, with a likelihood of one in 20,000,” Loeb said. “We should observe it. It doesn’t look like it’s a random occurrence.”

Big blue light surrounded by smaller dashes of light -- a visual image of comet 3I/ATLAS
NASA’s Hubble Space Telescope captured this image of interstellar comet 3I/ATLAS on July 21, 2025, when the comet was 277 million miles from Earth. (NASA)

Loeb advocates directing NASA’s Juno probe to intercept 3I/ATLAS for study. It’s also not a bad idea, he suggests, for the international community to get on the same page ahead of time in case alien intelligence does come knocking.

“You never know what type of intent it has,” Loeb says.

NASA says 3I/ATLAS is a comet that does not pose a risk to the Earth. Its name derives from the fact that it’s the third known interstellar object from outside our solar system; it was discovered by the Asteroid Terrestrial-impact Last Alert System.

Space

Copyright 2026 Nexstar Broadcasting, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

AUTO TEST CUSTOM HTML 20260112181412