A comet called 3I/ATLAS is making its closest approach to the sun today (Wednesday October 29)—but is it really an alien spacecraft as one prominent scientist has speculated? If 3I/ATLAS was a ...

Is 3I/Atlas an interstellar alien vessel or simply an intriguing, unique rock hurling through the cosmos? That debate has been raging ever since the comet, only the third known interstellar object to ...