Skip to main content

Up Next

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
Back to Show
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!

Support Provided By
Season
The Alchemy of Neutron Star Collisions
11:24
Many heavy elements were produced in a spectacular event: the collision of neutron stars.
The Cosmic Dark Ages
12:29
There was a time before the first star ignited. A time we call the cosmic dark ages.
Why Quantum Computing Requires Quantum Cryptography
13:58
Quantum computing is cool, but you know what would be extra awesome - a quantum internet.
The Real Science of the EHT Black Hole
11:07
The Real Science of the EHT Black Hole
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
Active loading indicator