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Is Pluto a Planet?

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.
Season 5 Episode 33 Length 14:03 Premiere: 09/23/19

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Specials

Season 5 Episodes

How To Capture Black Holes
S5 E45 Length 12:02 Premiere Date 01/13/20

How To Detect a Neutrino
S5 E44 Length 09:54 Premiere Date 01/06/20

Do Black Holes Create New Universes?
S5 E43 Length 12:24 Premiere Date 12/17/19

The Doomsday Argument
S5 E42 Length 12:50 Premiere Date 12/09/19

Is The Universe Finite?
S5 E41 Length 12:25 Premiere Date 12/02/19

Can You Observe a Typical Universe?
S5 E40 Length 13:36 Premiere Date 11/18/19

Does Life Need a Multiverse to Exist?
S5 E39 Length 13:09 Premiere Date 11/11/19

Why We Might Be Alone in the Universe
S5 E38 Length 12:24 Premiere Date 11/04/19

Is Time Travel Impossible?
S5 E37 Length 12:33 Premiere Date 10/21/19

Loop Quantum Gravity Explained
S5 E36 Length 13:49 Premiere Date 10/15/19

Black Hole Harmonics
S5 E35 Length 13:11 Premiere Date 10/07/19

How Many Universes Are There?
S5 E34 Length 14:03 Premiere Date 09/30/19

Is Pluto a Planet?
S5 E33 Length 14:03 Premiere Date 09/23/19

Could We Terraform Mars?
S5 E32 Length 15:33 Premiere Date 09/16/19

Is Earth's Magnetic Field Reversing?
S5 E31 Length 12:46 Premiere Date 09/03/19

How To Become an Astrophysicist
S5 E30 Length 12:45 Premiere Date 08/26/19

What Happened Before the Big Bang?
S5 E29 Length 10:23 Premiere Date 08/19/19

What Caused the Big Bang?
S5 E28 Length 13:12 Premiere Date 08/06/19

Did Time Start at the Big Bang?
S5 E27 Length 12:30 Premiere Date 07/18/19

The Quantum Internet
S5 E26 Length 11:35 Premiere Date 07/15/19

Thorium and the Future of Nuclear Energy
S5 E25 Length 16:05 Premiere Date 07/01/19

How Black Holes Kill Galaxies
S5 E24 Length 11:20 Premiere Date 06/17/19

The Alchemy of Neutron Star Collisions
S5 E23 Length 11:24 Premiere Date 06/06/19

The Cosmic Dark Ages
S5 E22 Length 12:29 Premiere Date 05/16/19

Why Quantum Computing Requires Quantum Cryptography
S5 E21 Length 13:58 Premiere Date 05/09/19

The Real Science of the EHT Black Hole
S5 E20 Length 11:07 Premiere Date 05/01/19

No Dark Matter = Proof of Dark Matter?
S5 E19 Length 10:37 Premiere Date 04/24/19

The Holographic Universe Explained
S5 E18 Length 14:39 Premiere Date 04/10/19

The Edge of an Infinite Universe
S5 E17 Length 15:16 Premiere Date 04/03/19

Could the Universe End by Tearing Apart Every Atom?
S5 E16 Length 13:21 Premiere Date 03/28/19

Is Dark Energy Getting Stronger?
S5 E15 Length 14:31 Premiere Date 03/20/19

Will You Travel to Space?
S5 E14 Length 12:46 Premiere Date 03/13/19

The Impossibility of Perpetual Motion Machines
S5 E13 Length 12:28 Premiere Date 03/06/19

Secrets of the Cosmic Microwave Background
S5 E12 Length 13:53 Premiere Date 02/20/19

Sound Waves from the Beginning of Time
S5 E11 Length 12:48 Premiere Date 02/07/19

Perpetual Motion From Negative Mass?
S5 E10 Length 14:28 Premiere Date 01/30/19

The Crisis in Cosmology
S5 E9 Length 13:17 Premiere Date 01/23/19

Our Antimatter, Mirrored, Time-Reversed Universe
S5 E8 Length 13:50 Premiere Date 01/16/19

Are Dark Matter And Dark Energy The Same?
S5 E7 Length 13:08 Premiere Date 01/09/19

Why String Theory is Wrong
S5 E6 Length 15:07 Premiere Date 12/20/18

Quantum Physics in a Mirror Universe
S5 E5 Length 12:18 Premiere Date 12/12/18

Did Life on Earth Come from Space?
S5 E4 Length 14:20 Premiere Date 12/06/18

'Oumuamua Is Not Aliens
S5 E3 Length 13:04 Premiere Date 11/21/18

Are Virtual Particles A New Layer of Reality?
S5 E2 Length 13:43 Premiere Date 11/14/18

Why String Theory is Right
S5 E1 Length 13:37 Premiere Date 11/07/18

Quantum Physics in a Mirror Universe
Preview Length 12:19 Premiere Date 12/17/18

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