Are we alone in the universe? Consider mysterious "extraterrestrial" radio signals. Unexplained gases on other planets.

Astronomers have identified GJ 3378b, a super-Earth located 25 light-years away, in the habitable zone of its star, raising ...

Thousands of tons of cosmic dust, like this micrometeorite pictured above, land on Earth every year. (Nicola ...

With new technologies come new opportunities. And that is especially true in astronomy—with every new advanced telescope, we ...