SciShow
Could Wormholes Really Exist?
If wormholes aren't just convenient plot devices for science fiction writers, they're still much weirder than anything we could make up.
SciShow
Could Naked Singularities Exist?
A naked singularity is something that should be a black hole, but it’s neither black nor a hole. If they exist, they’ll rewrite physics as we know it.
SciShow
Why Do People Say We've Reached the End of Physics?
Our fundamental picture of the universe seems pretty nearly complete these days, to the point that some people are suggesting that we’ve arrived at some version of “the end of physics.” And sure, physics is at a turning point, but it...
PBS
General Relativity & Curved Spacetime Explained!
We've been through the first few episodes of our crash course on general relativity, and came out alive! But it's officially "time" for CURVED spacetime. Join Gabe on this week's episode of PBS Space Time as he discusses Newton and...
SciShow
Could Life Have Survived in Mars's Ancient Lake?
Samples from the Curiosity rover suggest that Mars had a potentially habitable lake in its past, and gravitational lensing has helped scientists weigh a star!
SciShow
Gravitation: The Four Fundamental Forces of Physics #3
Hank continues our series on the four fundamental forces of physics with a description of gravitation -the interaction by which physical bodies attract with a force proportional to that of their masses, and which is responsible for...
SciShow
3 Ways Pi Can Explain Practically Everything
What’s irrational and never ends? Pi! Hank explains how we need pi to explain some of the most basic but most important principles of the universe, in honor of Pi Day.
SciShow
The Tiny Planet Revealing Gravity’s Big Secrets
Mercury’s path through our solar system is, well, a little eccentric, and some of its movements were a mystery astronomers couldn’t explain for a long time. Then, in the early 20th century, Einstein reran the numbers and proved a whole...
SciShow
How SpaceX Launched the World's Most Powerful Rocket
We've found the first evidence of planets outside of the Milky Way, and SpaceX has finally launched the Falcon Heavy rocket into space!
TED-Ed
TED-Ed: Hawking's black hole paradox explained | Fabio Pacucci
Today, one of the biggest paradoxes in the universe threatens to unravel modern science: the black hole information paradox. Every object in the universe is composed of particles with unique quantum properties and even if an object is...
SciShow
How To X-Ray A Black Hole
Black holes are everywhere, including at the center of our galaxy. But because they’re invisible they’re quite difficult to study. Looking at the disks of material surrounding them, however, can give us tons of clues about how they...
Be Smart
Einstein Was Right: Gravitational Waves Edition
A theory of physics 100 years in the making.
SciShow
What If the Large Hadron Collider Made a Black Hole?
Making a black hole in a particle accelerator sounds… a bit dangerous, to say the least, but scientists think that it could be possible! Here's why it probably wouldn't be dangerous -- and might even teach us something.
PBS
Why the Big Bang Definitely Happened
We pretty much know for sure that the universe was once extremely small, and extremely hot. And we know that something set it in motion, expanding rapidly and continuing to do-so today. But the actual moment of 'the Big Bang' is still a...
SciShow
The First Few Moments That Physics Can't Explain
Although science has provided astounding insights into the origins of the universe, we're still not quite sure what happened in those very first few moments.
PBS
Is Gravity An Illusion?
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...
SciShow
Gravitational Waves Discovered!
Einstein predicted their existence 101 years ago, and now it's official: we've detected gravitational waves directly for the first time ever!
TED Talks
TED: Questioning the universe | Stephen Hawking
In keeping with the theme of TED2008, professor Stephen Hawking asks some Big Questions about our universe -- How did the universe begin? How did life begin? Are we alone? -- and discusses how we might go about answering them.
Crash Course
Einstein's Revolution: Crash Course History of Science
There was physics before Einstein in the same way that there was biology before Darwin. Einstein didn’t just add some new ideas to physics. And he didn’t just add a unifying framework for doing physics, like Newton. Einstein took what...
Curated Video
What Would Happen if You Fell Into a Black Hole?
What is inside a Black Hole? A black hole is really not a celestial body like a planet or a star. There is really no substance there other than a severely curved space-time. It’a a region in space where matter is condensed to a...
Curated Video
What Is Reality? Exploring String Theory and the Multiverse
What is reality? What is the standard model trying to tell us? Are we living in the 11 dimensions of string theory? The holy grail of physics is a theory of everything. It may show the origin of all forces coming from one master force,...
Curated Video
Could Dark Matter Be an Illusion? Exploring the Case for MOND
Is it possible that what we have invented as dark matter to explain the motion of stars in galaxies and clusters is a figment of our imagination? Could it be that Einstein’s General Relativity has a flaw? Does dark matter exist? Vera...
Curated Video
Is Time Travel to the Past Scientifically Possible?
Traveling forward in time is not a problem. You're doing that now. Can we travel backward in time? There is a theoretically possible way to do it using wormholes. One solution to general relativity predicts an Einstein Rosen bridge,...
Curated Video
Why Gravity Defies Quantum Mechanics: The Ongoing Challenge
In a classical universe, if we knew all the positions and velocities for all particles, we could predict the future and the past. Quantum mechanics is not like this. It shows that reality is not deterministic but is probabilistic. The...