I/ATLAS is just the third recorded interstellar object to enter the solar system. However, the scientific consensus is that it's likely a comet.

A newly discovered interstellar comet, 3I/ATLAS, has sparked debate in the scientific community after Harvard astrophysicist Avi Loeb and his team proposed a speculative idea-that it might be an alien spacecraft.

An unusually comet has entered the Solar system. It poses no harm to Earth, say astronomers. That's the good news. Then one astronomer has made an outrageous claim: It is, quite possibly, an alien probe.