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
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.
Are Dark Matter And Dark Energy The Same?
13:08
Astronomers are the worst at naming things. Dark energy AND dark matter?
Why String Theory is Wrong
15:07
Why String Theory is Wrong
Quantum Physics in a Mirror Universe
12:18
What you think is a perfect reflection might be universe that is fundamentally different.
Did Life on Earth Come from Space?
14:20
Did life on Earth originate on another planet?
'Oumuamua Is Not Aliens
13:04
It’s never aliens … until it is. So let’s talk about ‘oumuamua.
Are Virtual Particles A New Layer of Reality?
13:43
Let me tell you a story about virtual particles. It may or may not be true.
Why String Theory is Right
13:37
Some see string theory as the one great hope for a theory of everything.
Supersymmetric Particle Found?
12:07
Supersymmetric Particle Found?
Active loading indicator