Aliens

An artist's impression of UFOs appearing over a small town.

To explore the galaxy and hunt for resources, intelligent aliens might need to turn their home stars into natural spaceships, a new paper suggests. A few known star systems might fit the bill.

The latest congressional UFO hearing featured testimony from former military personnel who told representatives that excessive government secrecy hides the fact that we are not alone in the cosmos.

A new model based on the famous alien-hunting Drake equation suggests that some parallel universes within the hypothetical "multiverse" could have higher chances of containing extraterrestrial life than our universe.

While such organisms may or may not exist in the universe, the research has important implications for future human endeavors in space.

A father and daughter team based in the U.S. have decoded a mock "alien signal" beamed from ESA's ExoMars Trace Gas Orbiter a year ago — but the meaning of the extraterrestrial message remains a mystery.

Astrophysicists estimate that any exponentially growing technological civilization has only 1,000 years until its planet will be too hot to support life.

The long-sought evidence of alien life could be lurking in Earth's oceans, says Harvard astrophysicist Avi Loeb. Here is his plan to find it.

The source of a supposed alien broadcast that made researchers go "Wow!" may instead have been the result of a remarkably rare cosmic event, a new study suggests.