A new government report describes 144 sightings of unidentified aerial phenomena.

Like Fox Mulder, people have a lot of strong opinions about UFOs.

Oxygen is thought to be a biomarker for extraterrestrial life, but there are at least three different ways that a lifeless planet can produce it.

Humans are more likely to have "first contact" with an advanced alien civilization, according to a recent NASA-funded paper.

Two new studies examine ways we could engineer human wormhole travel.

Three lines of evidence point to the idea of complex, multicellular alien life being a wild goose chase. But are we clever enough to know?

The search for alien life is far too human-centric. Our flawed understanding of what life really is may be holding us back from important discoveries about the universe and ourselves.

A strange object found in the desert has prompted worldwide speculation.

Zircons in a Martian meteorite widens the possible timeframe for life on Mars.

An ancient Martian meteorite carries with it some compelling implications.

Using a laboratory model, scientists get a nice Jovian surprise.

A new study from NASA and the SETI Institute comes up with an exciting number of potentially life-supporting planets.

The study identified superhabitable planets outside of our solar system.

Scientists have detected within the Venusian atmosphere a chemical known to be a byproduct of life.

The mission could launch as soon as the 2030s, the researchers said.

Just how close are we to setting up camp on another planet? It's complicated.

Hollywood has created an idea of aliens that doesn't match the science.

Astrophysicists calculate the likely number of civilization out there capable of communicating with us.

Tyson dives into the search for alien life, dark matter, and the physics of football.

A new study discovers the likelihood of extraterrestrial life in the universe.

When searching for extraterrestrial life, astronomers may want to look at planets with hydrogen-rich atmospheres.

It's the first time scientists have discovered an animal that doesn't perform aerobic respiration.

A volcano in California is a hot spot for conspiracy theorists.

Physicist Frank Wilczek proposes new methods of searching for extraterrestrial life.

Until about a decade ago, only two habitable zone planets of any size were known to astronomers: Earth and Mars.

The intelligent life we are searching for doesn't have to be humanoid.

Scientists are expert observers. Because of this, they can help us develop a keener view of the world — the cosmos.

Neil deGrasse Tyson wants to believe. He just needs to see the evidence first.

When it comes time for humanity to pick a new home, where will we go?

We still don't have proof of intelligent life beyond that on Earth.