General relativity is Einstein's masterpiece, dating back to 1915. It is still our best understanding of the universe, and of gravity. And with new technologies come new tests of any theory. Check out how, using atomic clocks, scientists are measuring the tiniest changes in time caused by the tiniest differences in gravity with a change in height of 1 millimeter!! This is ridiculous precision of the clocks to be able to do this, but we are at that level! It is equivalent to saying it would take 300 billion years for the two clocks to differ by 1 second. WOW!!
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