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A Harvard physicist who sounded the alarm earlier this month about a rare interstellar object passing through our solar system — suggesting it might be more than a comet — now says it could even be a nuclear-powered spaceship.

The object, 3I/ATLAS, was first detected in early July by an Asteroid Terrestrial-impact Last Alert System (ATLAS) telescope in Chile. It marks only the third time an interstellar object has been observed entering our solar system, according to NASA.

While NASA classified the object as a comet, Dr. Avi Loeb pointed out that an image showed an unexpected glow in front of the object rather than trailing behind it, something he called "quite surprising."

In a blog post this week, Loeb wrote that the

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