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

No. All clocks run at different speeds. Some faster, some slower. In fact, Mr. Bird’s clock on the roof is faster than Mr. Worm’s clock on the ground.