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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
No Dark Matter = Proof of Dark Matter?
10:37
We’ve been failing to detect dark matter for decades.
The Holographic Universe Explained
14:39
The Holographic Universe Explained
The Edge of an Infinite Universe
15:16
Have you ever asked “what is beyond the edge of the universe?”
Could the Universe End by Tearing Apart Every Atom?
13:21
Of all the unlikely ends of the universe, the Big Rip has to be the most spectacular.
Is Dark Energy Getting Stronger?
14:31
The power of Dark Energy may be increasing as the universe ages.
Will You Travel to Space?
12:46
Will You Travel to Space?
The Impossibility of Perpetual Motion Machines
12:28
Perhaps the most persistent nonsense in physics: the perpetual motion machine.
Secrets of the Cosmic Microwave Background
13:53
Secrets of the Cosmic Microwave Background
Sound Waves from the Beginning of Time
12:48
Sound Waves from the Beginning of Time
Perpetual Motion From Negative Mass?
14:28
Challenge question: if 1kg of apples is $5 and 2kg is $10, how much is -1kg of apples?
The Crisis in Cosmology
13:17
The hubble constant--the rate of expansion of our universe--has consumed astronomers.
Our Antimatter, Mirrored, Time-Reversed Universe
13:50
The foundations of quantum theory rests on its symmetries.
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