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PBS Space Time

Is Pluto a Planet?

Season 5 Episode 33 | 14m 03s

You know what a planet is, right? A big round thing that orbits a star. Uh, not so fast. The surprisingly vicious debate over the planetary status of Pluto has given us a fascinating glimpse into what a scientific definition really is. And perhaps the word planet is too vague to be used as a scientific definition at all.

Aired: 09/22/19
Extras
Watch • 15:14
PBS Space Time
What If the Cosmological Constant Is Not Constant?
Is Dark Energy Getting Weaker?
Episode: S10 E23 | 15:14
Watch • 16:08
PBS Space Time
What If The Universe Did Not Start With The Big Bang?
Here’s the story we like to tell about the beginning of the universe.
Episode: S10 E22 | 16:08
Watch • 17:44
PBS Space Time
The New Physics of Black Hole Star Capture | Extreme Tidal Disruption Events
We’ve never seen a TDE in the Milky Way, but we’ve seen them in distant galaxies.
Episode: S10 E21 | 17:44
Watch • 16:51
PBS Space Time
Can We Test Quantum Gravity?
Let’s talk about quantum gravity experiments that can be done here on Earth!
Episode: S10 E20 | 16:51
Watch • 19:25
PBS Space Time
Is Gravity RANDOM Not Quantum?
What if gravity isn’t weirdly quantum at all, but rather … just a bit messy?
Episode: S10 E19 | 19:25
Watch • 17:02
PBS Space Time
Can We Create New Elements Beyond the Periodic Table
Have we reached the end of the line of discoverable elements?
Episode: S10 E18 | 17:02
Watch • 15:32
PBS Space Time
Do Black Holes Have to Be Black?
Can we change the color of a black hole?
Episode: S10 E17 | 15:32
Watch • 18:26
PBS Space Time
Was Penrose Right? New Evidence For Quantum Effects In The Brain
Learn about Nobel laureate Roger Penrose's idea of how consciousness is caused by quantum processes.
Episode: S10 E16 | 18:26
Watch • 16:28
PBS Space Time
How To Detect Faster Than Light Travel
Faster than light travel may produce gravitational waves that we could see here on Earth.
Episode: S10 E15 | 16:28
Watch • 20:07
PBS Space Time
Can a Particle Be Neither Matter Nor Force?
All particles belong to two large groups: fermions and bosons.
Episode: S10 E14 | 20:07
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  • PBS Space Time Season 4
  • PBS Space Time Season 3
  • PBS Space Time Season 2
  • PBS Space Time Season 1
Watch • 15:14
PBS Space Time
What If the Cosmological Constant Is Not Constant?
Is Dark Energy Getting Weaker?
Episode: S10 E23 | 15:14
Watch • 16:08
PBS Space Time
What If The Universe Did Not Start With The Big Bang?
Here’s the story we like to tell about the beginning of the universe.
Episode: S10 E22 | 16:08
Watch • 17:44
PBS Space Time
The New Physics of Black Hole Star Capture | Extreme Tidal Disruption Events
We’ve never seen a TDE in the Milky Way, but we’ve seen them in distant galaxies.
Episode: S10 E21 | 17:44
Watch • 16:51
PBS Space Time
Can We Test Quantum Gravity?
Let’s talk about quantum gravity experiments that can be done here on Earth!
Episode: S10 E20 | 16:51
Watch • 19:25
PBS Space Time
Is Gravity RANDOM Not Quantum?
What if gravity isn’t weirdly quantum at all, but rather … just a bit messy?
Episode: S10 E19 | 19:25
Watch • 17:02
PBS Space Time
Can We Create New Elements Beyond the Periodic Table
Have we reached the end of the line of discoverable elements?
Episode: S10 E18 | 17:02
Watch • 15:32
PBS Space Time
Do Black Holes Have to Be Black?
Can we change the color of a black hole?
Episode: S10 E17 | 15:32
Watch • 18:26
PBS Space Time
Was Penrose Right? New Evidence For Quantum Effects In The Brain
Learn about Nobel laureate Roger Penrose's idea of how consciousness is caused by quantum processes.
Episode: S10 E16 | 18:26
Watch • 16:28
PBS Space Time
How To Detect Faster Than Light Travel
Faster than light travel may produce gravitational waves that we could see here on Earth.
Episode: S10 E15 | 16:28
Watch • 20:07
PBS Space Time
Can a Particle Be Neither Matter Nor Force?
All particles belong to two large groups: fermions and bosons.
Episode: S10 E14 | 20:07