Season
Season 2025 Episode
- Season 2019 Are Dark Matter And Dark Energy The Same?
- Season 2019 Our Antimatter, Mirrored, Time-Reversed Universe
- Season 2019 The Crisis in Cosmology
- Season 2019 Perpetual Motion From Negative Mass?
- Season 2019 Sound Waves from the Beginning of Time
- Season 2019 Secrets of the Cosmic Microwave Background
- Season 2019 The Impossibility of Perpetual Motion Machines
- Season 2019 Will You Travel to Space?
- Season 2019 Is Dark Energy Getting Stronger?
- Season 2019 Could the Universe End by Tearing Apart Every Atom?
- Season 2019 The Edge of an Infinite Universe
- Season 2019 The Holographic Universe Explained
- Season 2019 No Dark Matter = Proof of Dark Matter?
- Season 2019 The Real Science of the EHT Black Hole
- Season 2019 Why Quantum Computing Requires Quantum Cryptography
- Season 2019 The Cosmic Dark Ages
- Season 2019 The Alchemy of Neutron Star Collisions
- Season 2019 How Black Holes Kill Galaxies
- Season 2019 The Quasar from The Beginning of Time - STELLAR
- Season 2019 Thorium and the Future of Nuclear Energy
- Season 2019 The Quantum Internet
- Season 2019 Did Time Start at the Big Bang?
- Season 2019 Deciphering The Vast Scale of the Universe - STELLAR
- Season 2019 What Caused the Big Bang?
- Season 2019 Exploring Arecibo in VR 180
- Season 2019 What Happened Before the Big Bang?
- Season 2019 How To Become an Astrophysicist + Challenge Question!
- Season 2019 Is Earth's Magnetic Field Reversing?
- Season 2019 Could We Terraform Mars?
- Season 2019 Is Pluto a Planet?
- Season 2019 How Many Universes Are There?
- Season 2019 Black Hole Harmonics
- Season 2019 Loop Quantum Gravity Explained
- Season 2019 Is Time Travel Impossible?
- Season 2019 Why We Might Be Alone in the Universe
- Season 2019 Does Life Need a Multiverse to Exist?
- Season 2019 Can You Observe a Typical Universe?
- Season 2019 Is The Universe Finite?
- Season 2019 The Doomsday Argument
- Season 2019 Do Black Holes Create New Universes?
PBS Space Time - Season 2019 Episode 4 Perpetual Motion From Negative Mass?
10.00 48 minutes Exotic matter – matter with negative mass - has long been the pipedream of science fiction writers, futurists, and certain rather. . . optimistic researchers. It’s the key to faster than light travel because it’s the only stuff that can curve space in the right way to hold open wormholes and construct warp fields. And if you can travel faster than light you can also travel backwards in time. We’ve been over those already. And we also recently covered a very new use for negative mass: as “dark fluid”, a proposed explanation for both dark matter and dark energy. That episode really got me thinking about the subtleties of negative mass and how it should really behave gravitationally. Turns out it’s complicated, and to answer it we really have to question the very definition of mass.
