Astronomers have observed an object that originated from beyond our solar system, thought to be an interstellar comet, speeding through our celestial neighborhood.

It's only the third time that experts have spotted an object in the Milky Way that's come from a different solar system. Find out more here.

We have discovered two interstellar objects so far, ’Oumuamua and Comet 2I/Borisov. ’Oumuamua had no dust tail and a significant nongravitational acceleration, which led to a wide variety of hypotheses regarding its origin. 2I/Borisov was very clearly a comet, though it has a somewhat unique composition compared to comets in our solar system.