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PBS Space Time

How Do You Measure the Size of the Universe?

Video duration: 5:36Expires: 10/22/20Video has closed captioning.

The universe is HUGE. But, there is only so much of the universe we can ACTUALLY see, and if we wanted to measure that FINITE space, how would we do it? A gigantic ruler? One really long car ride? Or maybe it's something even more spectacular, something that involves not only the observable universe as it is NOW, but how it was when it was first BORN?

Episodes of PBS Space Time42

Video thumbnail: PBS Space Time LIGO's First Detection of Gravitational Waves!

PBS Space Time

LIGO's First Detection of Gravitational Waves!

Gravitational waves have officially been detected by LIGO!

7:29

LIGO's First Detection of Gravitational Waves!

7:29

Video thumbnail: PBS Space Time Will Mars or Venus Kill You First?

PBS Space Time

Will Mars or Venus Kill You First?

Our neighboring planets are not exactly the most hospitable places.

8:44

Will Mars or Venus Kill You First?

8:44

Video thumbnail: PBS Space Time The Origin of Matter and Time

PBS Space Time

The Origin of Matter and Time

Time to redefine our preconceived notions about mass and time.

9:21

The Origin of Matter and Time

9:21

Video thumbnail: PBS Space Time When Time Breaks Down

PBS Space Time

When Time Breaks Down

We learned how motion gives matter its mass, but how does motion affect time?

8:04

When Time Breaks Down

8:04

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