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How to Signal Aliens

How to Signal Aliens

Season 1 Episode 18
6:14
Can a Circle Be a Straight Line?

Can a Circle Be a Straight Line?

Season 1 Episode 20
8:16
The Leap Second Explained

The Leap Second Explained

Season 1 Episode 21
2:20
Can You Trust Your Eyes in Spacetime?

Can You Trust Your Eyes in Spacetime?

Season 1 Episode 22
9:23
Do Events Inside Black Holes Happen?

Do Events Inside Black Holes Happen?

Season 1 Episode 25
11:50
What if Singularities DO NOT Exist?

What if Singularities DO NOT Exist?

Season 10 Episode 1
14:44
What Happens If We Nuke Space?

What Happens If We Nuke Space?

Season 10 Episode 2
15:13
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PBS Space Time

Is Gravity An Illusion?

Season 1 Episode 17

Most of us take gravity as an assumed part of our living realities, but why? Basic physics introduces us to the concept of gravity from a Newtonian sense, but when you start factoring Einstein into an understanding of gravity, things get… weird. For example, gravity may simply not exist. Why? Watch this week’s episode of PBS Space Time and find out why gravity may be an illusion!

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Season
How We Know The Universe is Ancient
14:01
How do you learn the age of the universe when there’s no trace left of its beginnings?
Will Wormholes Allow Fast Interstellar Travel?
14:31
When do we get to wormhole ourselves out of here?
Was the Milky Way a Quasar?
13:31
Recently we discovered that its violent past was much more recent than we thought.
How We Know The Earth Is Ancient
13:38
How can we be sure about timescales so far beyond the capacity for human intuition?
What’s On The Other Side Of A Black Hole?
11:54
Normal maps are useless inside black holes.
How Black Holes Spin Space Time
12:49
If there’s one thing cooler than a black hole it’s a rotating black hole.
How Do Quantum States Manifest In The Classical World?
14:42
How do quantum states manifest in the classical world?
Does Quantum Immortality Save Schrödinger's Cat?
11:31
If the quantum multiverse is real there may be a version of you that lives forever.
How Decoherence Splits The Quantum Multiverse
15:09
Does conscious observation of a quantum system cause the wavefunction to collapse?
Does Consciousness Influence Quantum Mechanics?
13:17
There is an idea that consciousness can directly influence quantum systems.
Are Axions Dark Matter?
12:09
The axion may explain dark matter.
Are There Infinite Versions of You?
12:22
If the universe goes on forever, does that mean there are infinite versions of you?
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