Скачать или смотреть Deep secrets of space&time relationship | Explanation with Animation.

When you’re planning to meet up with someone, what do you specify? Just saying Grand Central isn’t enough, and just saying noon isn’t enough either. You need both a place and a time.

The same is true in physics. Physics explains the world of matter, moving and changing and interacting with other matter. All these events — motion, change, interaction — happen somewhere in space and somewhen in time.

It’s not too hard for us to think of space as a big, concrete whole and ignore our place in it. It’s very hard to do this for time. We think of “now” as absolute in a way that we don’t think of “here” as absolute. We look at events like this.
As it turns out, a quick trip into the world of large-scale physics makes it very hard to consider space and time separately. The reason is that space and time aren’t quite independent. Things that are farther away are also, in a sense, earlier. And this relationship bends and twists based on how heavy stuff is.
#space_time
#einstein
#universe