eli5 Is it correct to think of events happening on the far side of the universe or in a different galaxy as occurring “at the same time”?

Question

eli5 Is it correct to think of events happening on the far side of the universe or in a different galaxy as occurring “at the same time”?

In: Physics

Answer 1

There is no such thing as “at the same time” for things far away or moving very fast. It is perfectly possible for one observer to see A happening before B, and for another observer to see B happening before A.