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

Project Hail Mary, Solaris, and The Hitchhiker's Guide to the Galaxy are all among the very best sci-fi books set in space.

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

"We are essentially looking to remove all reliance on Earth's resources so that we can build a sustainable industry in space.

NASA's new alien-hunting telescope, the Habitable Worlds Observatory (HWO), will be serviceable out in space (and it will ...

High above the remote Pacific Ocean, about halfway between Hawaii and the northernmost part of Australia, an air-launched ...

A deleted scene finally explains the blockbuster’s most mocked plot hole, making its infamous alien hacking twist far easier ...

A rare visitor from another star system prompted SETI to hunt for alien technology, but the mysterious object appears to be a ...

A strange interstellar comet discovered last year and speculated by a prominent astronomer to be an alien spacecraft could be older than our Solar System, according to a new study. The comet, first ...

It was initially thought to have formed between three and 10 billion years ago, but researchers have now found that it could be even older, originating from an ancient planetary system nearly 12 ...