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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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Quantum Gravity and the Hardest Problem in Physics
12:20
General relativity and quantum mechanics seem to describe all of observable reality.
How Much Information is in the Universe?
9:28
The universe is full of stuff. But... is it actually made of stuff? Or information?
The Black Hole Entropy Enigma
11:41
Black Holes should have no entropy, but they hold most of the entropy in the universe.
Is There Life on Mars?
13:41
There is no greater hero in our search for life on mars than a robot named Opportunity.
How Will the Universe End?
12:37
In 100 trillion years the era of stars will be over.
Quantum Theory's Most Incredible Prediction
12:36
Do the theories of quantum physics truly represent the underlying workings of reality?
How Close To The Sun Can Humanity Get?
8:51
Humanity is coming closer to touching the Sun after launching the Parker Solar Probe.
Reversing Entropy with Maxwell's Demon
11:36
Can a demon defeat the 2nd Law of Thermodynamics?
The Misunderstood Nature of Entropy
10:58
Entropy is an intriguing and widely misunderstood concept.
Quantum Invariance & The Origin of The Standard Model
11:10
Learn about the standard model of particle physics, the most accurate physical theory yet.
Will A New Neutrino Change The Standard Model?
10:36
One paper reports on a new particle outside the standard model: the sterile neutrino.
How Asteroid Mining Will Save Earth
10:38
Forget oil. There’s another natural resource that’s never been touched, Asteroids.
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