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

A diagram shows the projected trajectory of the interstellar comet 3I/ATLAS, labeled C/2025 N1 here, as it travels through our solar system. NASA/JPL-Caltech ...

The Oort Cloud, an expanse of icy bodies in the far reaches of our solar system, is shown here in a scene from "Encounters in the Milky Way," a show at New York City's Hayden Planetarium that ...