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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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Hawking Radiation
12:00
Stephen Hawking's most famous prediction: the theory of Hawking Radiation.
Should Space be Privatized?
9:16
Will the future of space exploration be guided by public or private entities?
The Trebuchet Challenge
8:25
Do you have what it takes to calculate the awesome power of the trebuchet?
The Death of the Sun
9:01
What exactly will happen when the sun dies?
What is Energy?
11:20
Energy is the most powerful and useful concept in all of physics, but what exactly is it?
Kronos: Devourer Of Worlds
7:42
What happens when a star eats its planets? Find out on today’s Space Time Journal Club.
The End of the Habitable Zone
9:55
The Sun is getting brighter and the habitable planets in our solar system are changing.
Horizon Radiation
12:03
What is Horizon radiation? How does it apply to the Unruh Effect and Hawking Radiation?
What Do Stars Sound Like?
9:14
We can now map the interiors of stars by “listening” to their seismic wave harmonies.
Extinction by Gamma-Ray Burst
9:48
Find out about the last time and the next time the Earth will be hit by a Gamma-ray Burst.
The Origin of Our First Interstellar Visitor
9:06
We were recently visited by a traveler from outside our solar system: 'Oumuamua.
Understanding the Uncertainty Principle
11:19
Large-scale phenomena can give us incredible insights into the world of quantum mechanics.
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