Science, Maths & Technology
Explainer: Einstein's Theory of General Relativity
...becomes so strong that not even light (perhaps the fastest thing in the universe) is fast enough to get out. This is a black hole. Beautiful curves Starlight and black holes are fun, but what does this have to do with day-to-day life on Earth? Have you ever used the Global Positioning System (GPS)? It’s a common feature of mobile phones today, but it relies entirely on...