Have you ever wondered how Santa Claus delivers gifts to billions of children in just one night?
A jolly man in red, flying through the sky on a sleigh pulled by reindeer, sounds like magic. But physics can offer some fun explanations. Einstein’s special relativity, which shows that space and time are connected, that gravity is a curve in spacetime caused by heavy objects, and that time moves slower in stronger gravity, might help explain how Santa can reach 2.3 billion children in one night.