'We've never seen such a thing': Harvard expert flags odd piece of potential alien craft

A Harvard astronomer explained why an unidentified object detected this summer could potentially be an alien spacecraft.

Avi Loeb, the chair of the university's astronomy department, appeared Thursday on "CNN This Morning" to discuss speculation about the 3I/ATLAS interstellar object, which was first spotted on July 1 by the Deep Random Survey remote telescope in Chile.

"The brightness of the object implies a diameter of 20 km, and there is not enough rocky material, and there is not enough rocky material in interstellar space to deliver such a giant object per decade," Loeb said. "It takes 10,000 years for that much mass to arrive to the inner part of the solar system. Moreover, the trajectory of this object is very fine tuned. It lies in the plane of the orbits of the planets around the sun to within five degrees. The chance for that to happen is one in 500, and moreover, it passes very close to Jupiter, Mars and Venus with a chance of one per 20,000 if you just change the arrival time randomly, and it will arrive closest to the sun when the earth would be on the opposite side. We won't be able to observe it, but that's the perfect time for it to maneuver, and so we just need to watch it."

Loeb has posited that the object is slightly more likely than not to have been engineered instead of being a naturally occurring object, but he stopped short of saying it was built by alien life forms.

"I'm not saying it's an alien technology," Loeb said. "I'm just saying it doesn't look like a very common thing, and actually, the glow that is around this object, usually for comets, you see a trailing tail behind the object and here the glow from the Hubble Space Telescope image is actually in front of the object. We've never seen such a thing. A comet doesn't have glow in front of it."

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