PBS Anywhere

Providing Support for PBS.org

PBS Space Time

Is It Irrational to Believe in Aliens?

Video duration: 6:49Expires: 10/29/20Video has closed captioning.

Aliens! Could humans really be alone in this expansive universe? And if we're not, how come we've never made contact with other intelligent life? Everyone's thought about it; especially members of the scientific community. Join Gabe as he presents some of the most popular theories that scientists use to rationalize their support or skepticism of the existence of aliens.

Episodes of PBS Space Time68

Video thumbnail: PBS Space Time Did Dark Energy Just Disappear?

PBS Space Time

Did Dark Energy Just Disappear?

Did all of dark energy just vanish?

12:22

Did Dark Energy Just Disappear?

12:22

Video thumbnail: PBS Space Time The Many Worlds of the Quantum Multiverse

PBS Space Time

The Many Worlds of the Quantum Multiverse

Is our universe a definitive single reality? Can we even answer that question?

12:52

The Many Worlds of the Quantum Multiverse

12:52

Video thumbnail: PBS Space Time The First Humans on Mars

PBS Space Time

The First Humans on Mars

What might a budding Mars colony look like?

7:51

The First Humans on Mars

7:51

Video thumbnail: PBS Space Time Black Holes from the Dawn of Time

PBS Space Time

Black Holes from the Dawn of Time

Primordial black holes may be lurking throughout our universe.

10:16

Black Holes from the Dawn of Time

10:16

See all Episodes