spacetime

Spacetime is how we think about how places and things move in space and time. Time is something we all measure to know how long things have been happening and where things are in the world. Space is the big empty part of the universe around us and everything in it, like stars and planets. When we put space and time together, we get spacetime! Spacetime helps us understand things better by showing us how things are connected in our universe and how they move and change.