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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 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

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