Aliens

But there's so much, it might get in the way of detecting life.

Stephen Hawking expounded on everything from artificial intelligence to aliens to the end of the human race.

"We have no idea what's behind these weird incidents because we're not investigating," Christopher Mellon said.

Radio waves are fast, but not fast enough to reach us before a civilization goes extinct.

If we keep making satellites at the current rate, nearby planets could spot us by 2200.

The dents could have been left by life long ago, says one scientist.

We may finally have the tools we need to discover intelligent life on other planets—if only we'd stop making so much noise.

The recent clashes over fake news and climate change denial bear a startling resemblance to the clash on display in the UFO archives.

The search for alien life is closer to home than one may think.

Michio Kaku believes some of us might live to see the day that aliens finally make contact.

Scientists think you'd be cool with it.

The state is welcoming all aliens and alien-seekers with a fresh itinerary.

The devices were tested in an environment similar to Mars.

The video went viral on Thursday.

There is indeed evidence of an ancient ocean on Mars, but seashells and a sphinx? Not so much.

Here's why people who search for extraterrestrial intelligence love these strange flashes.

The award-winning moviemaker said he has "never been that scared in my life."

No one and nothing was safe this year.

The SpaceX founder joked with confused Twitter users saying his Falcon 9 rocket was a nuclear alien UFO from North Korea.

"No matter what we (or the aliens) do, we'll both make mistakes."

Neil deGrasse Tyson doesn't give an F about all this UFO talk.

Exploring for intelligent life isn't just whimsy, it's essential.

One said mermaids might be "alien species that lives in parts of the Indian Ocean we've never explored before."

Far more Americans believe in a second JFK shooter than support Donald Trump, polls show. But can the president beat out Bigfoot?

Metalworkers in the ancient world would hunt for iron from meteorites to create rare weapons and artefacts.

The former Blink-182 star is getting renewed attention after revelations of the Pentagon's UFO research program.

The Defense Department investigated reports of everything from "glowing auras" to unidentified flying objects.

The trio are heading to space to carry out scientific experiments.

Any unusual noise would signal something weird is happening, and the examination is not over.

The discovery opens up the tantalizing possibility that on other planets, life forms that need only atmospheric gas to survive exist, too.