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PBS Space Time

The Strange Universe of Gravitational Lensing

In the world of our mind’s eye, light travels in a straight line. In reality, spacetime is deflected and magnified through the lens of gravity. Find out how this works and what it allows us to learn about our universe in this episode of Space Time.

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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?
Was the Milky Way a Quasar?
13:31
Recently we discovered that its violent past was much more recent than we thought.
How We Know The Earth Is Ancient
13:38
How can we be sure about timescales so far beyond the capacity for human intuition?
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