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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 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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