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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 Time51

Video thumbnail: PBS Space Time Will Starshot's Insterstellar Journey Succeed?

PBS Space Time

Will Starshot's Insterstellar Journey Succeed?

Starshot is an interstellar travel expedition unlike any other before it.

8:51

Will Starshot's Insterstellar Journey Succeed?

8:51

Video thumbnail: PBS Space Time What Does Dark Energy Really Do?

PBS Space Time

What Does Dark Energy Really Do?

How does dark energy affect the universe's expansion?

9:50

What Does Dark Energy Really Do?

9:50

Video thumbnail: PBS Space Time Why the Universe Needs Dark Energy

PBS Space Time

Why the Universe Needs Dark Energy

What's needed to determine the shape and geometry of our universe?

9:33

Why the Universe Needs Dark Energy

9:33

Video thumbnail: PBS Space Time Will the Universe Expand Forever?

PBS Space Time

Will the Universe Expand Forever?

Many have tried to speculate about what the fate of the universe would be.

9:51

Will the Universe Expand Forever?

9:51

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