Comet 3I/ATLAS, only the third known visitor from beyond our Solar System, has been brightening far more rapidly than expected as it approaches perihelion, its closest point to the Sun.

The comet is the third interstellar object (hence the “3I”) we’ve detected flying through our Solar System. This isn’t the first time the alien question has come up in the context of a new ...

I/ATLAS, an interstellar object the size of Manhattan, recently showed signs of non-gravitational acceleration and was seemingly “bluer than the Sun” as it went past Earth’s local star. According to ...