From mudstones on Mars to strange gases in exoplanet atmospheres, tentative evidence for extraterrestrial life is starting to ...

Cassini confirmed that Titan is one of the only worlds in the solar system with stable liquid on its surface. But when ...

From budgetary issues to wanting to recast Sigourney Weaver as Ellen Ripley, James Cameron’s version of Aliens almost never ...

From Viking to Perseverance, scientists have spent decades chasing chemical hints that could point to life beyond Earth.

One that caught attention from many was a type of sea mollusk that washed ashore on South Padre Island in late May.

Mars. From forming black holes to phantom dark energy, discover the cosmic mysteries astronomers uncovered last year.

The research is mounting up that we might not be alone in this big wide world. So what's the likelihood that aliens are out ...

Europa has a vast, saltwater ocean beneath its icy shell, with more than twice the amount of water in all of Earth’s oceans ...

Polling shows that nearly half of Americans now believe aliens have visited this planet—and that the number who aren't sure ...

Unlike ʻOumuamua's eerie lack of coma or Borisov's more predictable gas cloud, 3I/ATLAS stayed stubbornly inert until late, ...

Is 3I/ATLAS a comet or an alien ship? Harvard's Avi Loeb warns of a 'serial killer' visitor as the interstellar object makes ...

A mysterious metal shard, once thought to be a piece of a UFO that crashed in 1947, has sparked years of wild speculation.