Does expansion of space violate conservation of energy?

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I know spacetime is something but I am wondering what that something is. is it only the gravitational field? is the geometry of spacetime, gravity?
 
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Freeman Dyson said:
I know spacetime is something but I am wondering what that something is. is it only the gravitational field? is the geometry of spacetime, gravity?
Our understanding is just that gravity is a word we use to describe the curvature of space-time, and especially how matter affects and reacts to that curvature.
 

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