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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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Season
Are Dark Matter And Dark Energy The Same?
13:08
Astronomers are the worst at naming things. Dark energy AND dark matter?
Why String Theory is Wrong
15:07
Why String Theory is Wrong
Quantum Physics in a Mirror Universe
12:18
What you think is a perfect reflection might be universe that is fundamentally different.
Did Life on Earth Come from Space?
14:20
Did life on Earth originate on another planet?
'Oumuamua Is Not Aliens
13:04
It’s never aliens … until it is. So let’s talk about ‘oumuamua.
Are Virtual Particles A New Layer of Reality?
13:43
Let me tell you a story about virtual particles. It may or may not be true.
Why String Theory is Right
13:37
Some see string theory as the one great hope for a theory of everything.
Supersymmetric Particle Found?
12:07
Supersymmetric Particle Found?
Will We Ever Find Alien Life?
12:44
Recent surveys draw scientific conclusions about the persistent absence of aliens.
What are the Strings in String Theory?
13:20
How did physicists even come up with String Theory?
Computing a Universe Simulation
12:04
Is it possible to simulate the entire universe on a computer smaller than the universe?
How to Detect Extra Dimensions
11:46
How gravitational waves can be used to search for extra dimensions of space!
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