And Einstein — Space, Time

These are regions where spacetime is curved so severely that not even light can escape the "dip."

Understanding spacetime allows scientists to trace the expansion of the universe back to its very beginning. Space, Time and Einstein

Satellites move fast and are further from Earth’s gravity, meaning their clocks tick differently than ours. Without Einstein’s equations, your phone’s GPS would be off by kilometers within a single day. These are regions where spacetime is curved so