Extraterrestrial life

"'Are we alone?' is one of the biggest unanswered questions," said study first author Howard Chen.

Human's evolved through a series of highly unlikely events—so finding another intelligence like us would be like winning the lottery many times over.

"I can't believe we are the only living entity in the universe," Didier Queloz said

Data from the Cassini mission have revealed molecules in ice grains emanating from the icy, water-rich world.

Two Dutch YouTubers drove three miles into the Nevada National Security Site in an attempt to access Area 51 and discover evidence of alien life.

Most Americans believe the governent is hiding something about UFOs, with the belief in extraterrestrial spaceships held by a substantial minority.

"In the search for life beyond our solar system, the most promising planets might not be Earth twins," says geochemist Stephanie Olson.

Astronomer says he is "not paying much attention to what happens in Area 51."

Do you care about the search for extraterrestrial intelligence? Let these researchers know.

The conference about a "major new science mission" will be held at 4 p.m. EDT.

The ocean is thought to be be billions of years old and may contain as much as three times the volume of all the liquid water on Earth.

Build-ups of toxic gases in the atmospheres of many exoplanets in the "habitable zone" could limit the "safe zone" in which life outside our solar system could actually exist.

NASA's James Webb Telescope will open up an entirely new avenue for searching for extraterrestrial life.

Former Democratic Senator Harry Reid wants the U.S. to obtain UFO technology before China and Russia.

Study examines the Fermi Paradox—that aliens should exist, but we have not found them.

Physics may ensure speciation is only possible within a narrow band, a new book argues, lending credence to our human-centric depiction science fiction depictions of extraterrestrial life.

The plot of 'The Predator' bears some striking similarities to testimony made by believers in alien conspiracy theories.

Scientists think life might survive on Proxima b, in spite of powerful lashings from its host star.

Four disc shaped objects prompted various conspiracy theories.

George Van Tassel's Integratron, subject of new documentary "Calling All Earthlings," was built from alien blueprints to reverse aging, travel through time and produce free energy.

The scientists will study what's happening 3,000 feet below the ocean's surface, above what will one day become the newest island in the chain.

New disclosures from inside the Pentagon's Top Secret UFO program include the connection between aliens, poltergeists, extra dimensions and "bizarre creatures."

Some scientists really do think it's possible.

Terrestrial life is intimately influenced by the tilt of Earth's axis, so it shouldn't surprise us if the same is true elsewhere.

Where do they come from? How do they work? And of course, will they help us find aliens?

Europa Clipper is scheduled to leave for the moon in the 2020s.

Astronomers will comb through millions of stars in the search.

Can MUFON, the premiere UFO sightings and investigation organization, recover from a wave of resignations after a racist Facebook post?

Stronger gravity requires stronger—and pricier—rockets to overcome.

This is what NASA's brand new telescope can and can't learn about exoplanets.