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PBS Space Time

Will the Universe Expand Forever?

Throughout history, there has been much speculation about what the fate of the universe would be. Many theorized that the universe would eventually succumb to the pull of gravity, and reverse its expansion in what was being called ‘The Big Crunch.’ However, with the help of mathematical equations from Newton, Einstein, and Alexander Friedmann, we now have an answer.

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Season
How Stars Destroy Each Other
10:41
We take a look at the dysfunctional stellar relationships among the stars.
The Boundary Between Black Holes & Neutron Stars
11:22
The boundary between neutron stars and black holes promises to reveal secrets of both.
Does Antimatter Explain Why There's Something than Nothing
12:43
The most precious substance in our universe is not gold, nor oil. It's antimatter.
Dissolving an Event Horizon
11:32
Despite what the cosmic censorship hypothesis suggests, naked singularities may exist.
Building Black Holes in a Lab
13:12
It's very hard to study black holes but studying black hole analogies makes it easier.
What Happens After the Universe Ends?
14:34
Sir Roger Penrose's Conformal Cyclic Cosmology hypothesis.
Can Viruses Travel Between Planets?
13:58
Viruses don’t just influence organisms, they’re incredibly important on a planetary scale.
Does Gravity Require Extra Dimensions?
12:41
Does gravity require extra dimensions?
Mapping the Multiverse
14:21
This is a map of the multiverse.
How Luminiferous Aether Led to Relativity
13:52
How Luminiferous Aether led to Relativity.
How We Know The Universe is Ancient
14:01
How do you learn the age of the universe when there’s no trace left of its beginnings?
Will Wormholes Allow Fast Interstellar Travel?
14:31
When do we get to wormhole ourselves out of here?
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