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

If you involve relativity events “happening at the same time” depends on the observer.

So you can say some things are happening simultanously, but you have to say from wich perspective.

There is no universal neutral observer that could give you a “most correct” order of events.