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PBS Space Time
The Strange Universe of Gravitational Lensing
Season 2
Episode 33
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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14:01
How do you learn the age of the universe when there’s no trace left of its beginnings?
13:31
Recently we discovered that its violent past was much more recent than we thought.
13:38
How can we be sure about timescales so far beyond the capacity for human intuition?
12:49
If there’s one thing cooler than a black hole it’s a rotating black hole.
14:42
How do quantum states manifest in the classical world?
11:31
If the quantum multiverse is real there may be a version of you that lives forever.
15:09
Does conscious observation of a quantum system cause the wavefunction to collapse?
13:17
There is an idea that consciousness can directly influence quantum systems.
12:22
If the universe goes on forever, does that mean there are infinite versions of you?