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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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Do Black Holes Create New Universes?
12:24
Do black holes create new universes?
The Doomsday Argument
12:50
A simple statistical argument tells us that the doom of our species is much, much closer.
Is The Universe Finite?
12:25
Our universe may actually be finite in size.
Can You Observe a Typical Universe?
13:36
How do you correctly use the anthropic principle?
Does Life Need a Multiverse to Exist?
13:09
Does life need a multiverse to exist?
Why We Might Be Alone in the Universe
12:24
Why does it appear, that humanity is the lone intelligence in the universe?
Is Time Travel Impossible?
12:33
Is Time Travel Impossible?
Loop Quantum Gravity Explained
13:49
What exactly is it?
Black Hole Harmonics
13:11
We’ll explore the papers that claim to have detected black hole harmonics.
How Many Universes Are There?
14:03
The universe is big, but it’s peanuts compared to the eternally inflating multiverse
Is Pluto a Planet?
14:03
You know what a planet is, right? A big round thing that orbits a star. Uh, not so fast.
Could We Terraform Mars?
15:33
Could we terraform Mars?
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