Why This Universe? Maybe It’s Not Special—Just Probable
Two physicists find that our universe has a higher entropy—and is therefore more likely—than alternative possible universes. ..
Two physicists find that our universe has a higher entropy—and is therefore more likely—than alternative possible universes. ..
In this cartoon world built to teach concepts from Randall Munroe’s book What If? 2, you can fly a rocket around randomly—or explore the physics of an alternate ..
The past and future are tightly linked in conventional quantum mechanics. A tweak could let quantum possibilities increase as space expands. ..
A growing catalog of huge but dim “ultra-diffuse” galaxies is forcing astronomers to invent new theories of galactic evolution. ..
To send astronauts on long-term space missions, it’ll take rotating habitats to produce artificial gravity. But that’s trickier than you might think. ..
NASA will soon release the results of its DART mission to find out whether crashing a probe into a space rock can deflect it. Here’s how they'll do the math. ..
In What If? 2, Randall Munroe explains that evading gravity can reduce your mass—but let’s do the math to see how far you have to go. ..
If you want to attain high speeds without getting airborne, it helps to know a little something about friction. ..
It’s impossible to reduce gravity, but you can find some clever ways around it. ..
Heavenly bodies are always in motion: Pushing back the asteroid probe’s blastoff date could require a new trajectory, longer travel time, and much more ..