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quote:If a ball 1 foot in diameter and 5 feet away from another ball also 1 foot in diameter was expanded by a factor of two ,each ball would be 2 feet in diameter with a distance between them of 9 feet. This would still be detected as moving away from each other.
quote:Originally posted by Solvay_1927But how do you measure the 9 feet (or 10 feet, as I think it should say)? Using a 1 foot ruler? But the ruler will also have doubled in size (along with everything else in the universe), so you'll still measure the distance between the balls to be 5 "ruler lengths". And you've no way of telling the ruler length has changed, because anything in the world (or universe) that you could compare it to - including yourself - has also changed in the same proportions.