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PBS Space Time

How Do You Measure the Size of the Universe?

Season 1 Episode 3 | 5m 36s

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?

Aired: 02/24/15
Extras
Watch • 15:35
PBS Space Time
Does Infinity - Infinity = an Electron
What do you get if you combine something that’s infinitely massive and negative infinitely massive?
Episode: S10 E30 | 15:35
Watch • 13:39
PBS Space Time
What Does An Electron Actually Look Like?
What does an electron really look like?
Episode: S10 E29 | 13:39
Watch • 17:19
PBS Space Time
Does the Planck Length Break E=MC^2?
I’d like to invite you to an even higher level of nerdom!
Episode: S10 E27 | 17:19
Watch • 11:43
PBS Space Time
Can the Universe Remember? Exploring Gravitational Memory
Gravitational tsunamis exist and we’re on the verge of being able to detect them.
Episode: S10 E26 | 11:43
Watch • 18:40
PBS Space Time
How Can Humanity Become a Kardashev Type 1 Civilization?
Will we ever become a Kardeshev Type-1 civilization and how can we get there?
Episode: S10 E25 | 18:40
Watch • 14:05
PBS Space Time
Do Neutron Stars Shine In Dark Matter?
New data is telling us that Neutron stars may make one of the most popular dark matter candidates.
Episode: S10 E24 | 14:05
Watch • 15:14
PBS Space Time
What If the Cosmological Constant Is Not Constant?
Is Dark Energy Getting Weaker?
Episode: S10 E23 | 15:14
Watch • 16:08
PBS Space Time
What If The Universe Did Not Start With The Big Bang?
Here’s the story we like to tell about the beginning of the universe.
Episode: S10 E22 | 16:08
Watch • 17:44
PBS Space Time
The New Physics of Black Hole Star Capture | Extreme Tidal Disruption Events
We’ve never seen a TDE in the Milky Way, but we’ve seen them in distant galaxies.
Episode: S10 E21 | 17:44
Watch • 16:51
PBS Space Time
Can We Test Quantum Gravity?
Let’s talk about quantum gravity experiments that can be done here on Earth!
Episode: S10 E20 | 16:51
Latest Episodes
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  • PBS Space Time Season 5
  • PBS Space Time Season 4
  • PBS Space Time Season 3
  • PBS Space Time Season 2
  • PBS Space Time Season 1
Watch • 15:35
PBS Space Time
Does Infinity - Infinity = an Electron
What do you get if you combine something that’s infinitely massive and negative infinitely massive?
Episode: S10 E30 | 15:35
Watch • 13:39
PBS Space Time
What Does An Electron Actually Look Like?
What does an electron really look like?
Episode: S10 E29 | 13:39
Watch • 17:19
PBS Space Time
Does the Planck Length Break E=MC^2?
I’d like to invite you to an even higher level of nerdom!
Episode: S10 E27 | 17:19
Watch • 11:43
PBS Space Time
Can the Universe Remember? Exploring Gravitational Memory
Gravitational tsunamis exist and we’re on the verge of being able to detect them.
Episode: S10 E26 | 11:43
Watch • 18:40
PBS Space Time
How Can Humanity Become a Kardashev Type 1 Civilization?
Will we ever become a Kardeshev Type-1 civilization and how can we get there?
Episode: S10 E25 | 18:40
Watch • 14:05
PBS Space Time
Do Neutron Stars Shine In Dark Matter?
New data is telling us that Neutron stars may make one of the most popular dark matter candidates.
Episode: S10 E24 | 14:05
Watch • 15:14
PBS Space Time
What If the Cosmological Constant Is Not Constant?
Is Dark Energy Getting Weaker?
Episode: S10 E23 | 15:14
Watch • 16:08
PBS Space Time
What If The Universe Did Not Start With The Big Bang?
Here’s the story we like to tell about the beginning of the universe.
Episode: S10 E22 | 16:08
Watch • 17:44
PBS Space Time
The New Physics of Black Hole Star Capture | Extreme Tidal Disruption Events
We’ve never seen a TDE in the Milky Way, but we’ve seen them in distant galaxies.
Episode: S10 E21 | 17:44
Watch • 16:51
PBS Space Time
Can We Test Quantum Gravity?
Let’s talk about quantum gravity experiments that can be done here on Earth!
Episode: S10 E20 | 16:51