About 50 billion rogue planets are roaming the Milky Way with no host star to hold on to, some of them three times bigger than the Earth. They don’t give off any...
Black holes are dark, matter-devouring balls of gravity. Most of them are so far away that we don’t need to worry about them. But not this one. Meet Gaia BH1. This...
Body-crushing pressure. Toxic atmospheres. Unbearable temperatures. That’s what would be in store if you visited other planets in our Solar System. But what other...
[dx_custom_adunit mobile_id=”RTK_v1lP”] What if your reality was nothing more than a complex computer simulation? And if you were just a program on someone...
Watch out for loose superbugs.
Would you spend a night at the top of the first tower to space? At 100 km above sea level, it would be the highest structure that humans have ever built. This tower...
Today on What If, we’re going to build the highest bridge on planet Earth. Welcome to the Qinghai-Tibet Plateau, the “Roof of the World.”It’s home to the world’s...
Saturn is one of the most mesmerizing planets in our Solar System. Famous for its iconic rings, it is also a world of extreme weather and puzzling mysteries. While other...
This galactic collision might be more impactful than you think.
Billions of years from now, the Sun will become a red giant. And then, it will slowly die. That’s right. It’s the end of the Solar System, and this is your survival...
Are all of your memories real? Did everything happen the way you remember it? What if somebody filled your brain with memories that aren’t yours? Would you be able...
Dark, mysterious and consuming everything around them, black holes will rip apart anything that passes their event horizons. But could there be more? What would happen...
Betelgeuse, Betelgeuse, Betelgeuse. Saying its name three times won’t have the same effect as a certain bio-exorcist, but it’s still a sight to behold. At about 950...
Watch your head. Some seriously big asteroids are crashing into Earth. What kinds of shapes and sizes do they have? Which ones would have the deadliest impact? And which...
Welcome to your new landfill: a giant ball of burning gas that we call the Sun. With surface temperatures of 5500°C (9,940°F), it could obliterate any type of trash we...
The Big One. Those three words make locals along the West Coast of North America shudder with fear. This area is plagued by earthquakes. But hey, at least they are ready...
On the morning of September 11th, 2001, tragedy struck when two hijacked airplanes crashed into the World Trade Center towers in New York City. After that, everything...
If the Universe is full of stars, why doesn’t it appear white? And if it did, what would that look like? Would all the black holes suddenly become visible? And if...
Uh-oh. Looks like somebody left the gas running on Jupiter. Don’t do anything stupid, like lighting a humongous match. What would a match need to be made of to ignite...
In 1998, a gentleman by the name of John Titor arrived from the future, or so he said. In his timeline, as he claimed, General Electric had managed to invent time travel...
