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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
Why the Universe Needs Dark Energy
9:33
What's needed to determine the shape and geometry of our universe?
We Are Star Stuff
10:38
Stars are our stellar alchemists.
Will Starshot's Insterstellar Journey Succeed?
8:51
Starshot is an interstellar travel expedition unlike any other before it.
How Cosmic Inflation Flattened the Universe
10:17
The Big Bang Theory only gets us part of the way there.
Why is the Earth Round and the Milky Way Flat?
10:48
Our universe is not a very diverse place when it comes to shapes.
What’s Wrong With the Big Bang Theory?
9:56
We continue our search for a grand unifying theory of the Big Bang!
Why the Big Bang Definitely Happened
8:54
The actual moment of ‘the Big Bang’ is still a bit of a grey area within physics.
Should We Build a Dyson Sphere?
10:14
The Kepler telescope recently found a strange partial eclipse...possibly a Dyson Sphere.
How the Quantum Eraser Rewrites the Past
10:06
Causality is meant to move in one direction: forward.
LIGO's First Detection of Gravitational Waves!
7:29
Gravitational waves have officially been detected by LIGO!
Can We Survive the Destruction of the Earth?
10:34
What do we do to protect ourselves from extinction level events?
Will Mars or Venus Kill You First?
8:44
Our neighboring planets are not exactly the most hospitable places.
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