When something IS isn't it instantaneously happening?

Question

not 2 separate things happening at once. but 1 thing doing two separate things maybe like electromagnetism. and not necessarily observable by the human eye.

i read gravity propagates faster than light, is that true?

i have a problem with general relativity (the spacetime curvature) aren't humans only constrained by time-is light, air,plants,...

Answer 1

You are asking many questions really. Mostly about relativity it seems. And relativity is REALLY hard to understand. Almost as hard as quantum mechanics. Most people don't really understand it and just can't accept it at all.

But there is one simple question in there I can answer.

Nobody knows for sure how fast gravity propagates, but most scientists think it probably propagates at the speed of light and not faster. But thinking up an experiment you could actually do to prove that isn't so easy, so no proof has been found yet.

Answer 2

Well, if something happens in universe it will take years or even ten thousands of years for us to notice... For example, if Eta Carinae is exploded then we will not notice it until 5000-6000 years from now when we will say large hypernova in Southern Sky..

Answer 3

Time does need to be warped if we are to assume that the speed of light is a constant in all velocity frames. the latter implies the former in no uncertain terms- time is inescapably "bendable" if we make this assumptioon that Einstein made.

Don't think of just time- time to someone may be space for someone else with relative velocity (you are length contracted to them, so you lose "space", but gain time, because of time dilation). Two simultaneous events may not be simultaneous to a passer by- so there is "no time" between the events for this passer by, where there is time between the events for the stationary person.

Spacetime, however, is a geometry in which we can have Lorentz-invariant quantities, which means that all observers agree.

I hope I've been clear- I couldn't quite make sense of your first question. I think your wording is unclear: "but 1 thing doing two separate things"- electromagnetism is a force, but you can seperate them into electric and magnetic parts. I think it's the verb "doing" which makes everything unclear. What exactly is the electromagntic field "doing" twice at once?