physics

Earth spins at 1,674 km/h at the equator. If it suddenly stopped, supersonic winds would devastate the surface. If it slowed gradually, the consequences are still severe — a 6-month day, ocean redistribution, and a collapsing magnetic field.

How close would a black hole have to be to destroy Earth? The answer depends on its mass and distance, and the numbers are stranger than the myth of a cosmic drain.

General relativity describes gravity at cosmic scales. Quantum mechanics rules the subatomic world. They are mutually incompatible — and unifying them is the deepest unsolved problem in all of physics.

A ringworld would not break any law of physics, but it would break every material we know. The spin arithmetic shows exactly where each megastructure sits on the ladder from buildable to impossible.

The event horizon is the point of no return — beyond it, not even light can escape. But what actually happens inside? The physics gets strange fast: time and space swap roles, the singularity may not be what we think, and quantum mechanics breaks everything.

Space and time aren't separate things — they're a single four-dimensional fabric that can bend, stretch, and warp. Massive objects curve spacetime, and that curvature is what we experience as gravity. Here's what Einstein actually discovered.

The nearest star is 4.24 light-years away — roughly 40 trillion kilometres. Reaching it with current technology would take 80,000 years. What would it actually take to become a civilisation that spans multiple star systems?

Individual neurons don't think. Individual water molecules aren't wet. But billions of them together produce consciousness and liquid flow. Emergence — when the whole becomes more than the sum of its parts — is one of science's most profound concepts.

Every quantum event creates branching parallel universes, at least according to one leading interpretation of quantum theory. It sounds insane, but many physicists consider it the most literal reading of the equations.

At the equator, you're moving at 1,674 km/h because the Earth is rotating. You can't feel it. Here's the Newtonian mechanics and relativistic physics that explain why — and the real clues that reveal Earth's rotation.

Nothing with mass can reach the speed of light. But shadows, spots of light, and the expansion of the universe can move faster than light without violating physics. Here's the strange truth about superluminal motion.

Atoms are almost entirely empty space. If you compressed all of humanity to nuclear density, the result would be about the size of a sugar cube. Here's the quantum physics behind why that doesn't work in ordinary matter, and where stars do it anyway.