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Given 2 objects moving at some velocity v relative to one another, is it possible to...

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Physics

Given 2 objects moving at some velocity v relative to oneanother, is it possible to determine whether they are moving orwhether the space between them is expanding?

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4.2 Ratings (796 Votes)
Firstly remember what it means for space to be expanding it doesnt mean that space is some rubbery fabric that gets pulled it means that the metric of space is expanding That is the scale factor which essentially represents the relative distance of objects is growing in time So if all galaxies were separated by some distance this distance would then be larger at a later time So how could we tell that the expansion is really metric expansion and not relative velocity Well the    See Answer
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