Up Next
Something Disturbing Happens When You Solve Einstein's Equations This Way
Season 11
Episode 25
14:42
We Thought Black Holes Ended in Singularities. They Might End In a Frozen Big Bang
Season 11
Episode 28
14:27
We’ve Been Looking for Aliens for 70 Years. We've Been Doing It Wrong All Along
Season 11
Episode 29
20:48
The Universe Has Been Expanding Since the Big Bang. Just Not How We Thought.
Season 11
Episode 32
17:40
Back to Show
PBS Space Time
Dark Energy Is Driving the Universe Apart. We May Finally Know Why.
Season 11
Episode 22
We’ve known since 1929 that the universe is expanding, and since 1998 that it’s speeding up. The unknown force behind this acceleration is called “dark energy,” assumed to stay constant in density. But new evidence hints it may change over time, possibly explaining why major measurements of the universe’s expansion rate don’t agree.
Support Provided By
17:23
How is it possible to tell if a space rock will one day collide with the Earth?
15:58
Did you know that many of us have up to 4% neanderthal DNA?
19:39
Why are billions suddenly being pumped into fusion startups?
16:36
The universe should've collapsed after the Big Bang, but a light Higgs boson let us exist.
18:32
Dark matter has eluded us for many decades but we may be able to discover more now.
15:35
What do you get if you combine something that’s infinitely massive and negative infinitely massive?
16:35
Is there a limit to how much energy you can cram into, or pull out of one patch of space?
11:43
Gravitational tsunamis exist and we’re on the verge of being able to detect them.