Quantum mechanics

The mishaps caused by time travellers exploring the past are a staple of science fiction. But what does physics think?

Google, Nasa and Lockheed Martin have all backed an experimental machine that could transform computing. But what do they want it for?

This isn’t an idle question, if you’re thinking of sending spacecraft and people up there. Or if you want to test fundamental theories in quantum physics.

Fears that the Large Hadron Collider could destroy the world may be unfounded, but if we really wanted to make a black hole, could we actually do it?

If the baffling behaviour of subatomic particles leaves you scratching your head with confusion, don’t worry. Physicists don’t really comprehend it either.

Einstein said it is impossible, but some scientists are still trying to break the cosmic speed limit – even if it means bending the laws of physics.