During ten seconds of weightlessness Brynle Barrett from the Laboratory of Photonics, Numerical Sciences and Nanosciences at the University of Bordeaux monitors an experiment to test the ‘weak equivalence principle’ – or why a feather in a vacuum falls as fast as a hammer.
Einstein's Equivalence Principle Put to Test, Discovery News | 5/6/16 An orbital experiment is about to test to see if objects really fall at same speed in a gravitational field — or if some exotic physics may be detected.
Astronomers have discovered the first pulsar (PSR J0337+1715) with two stars circling it. By watching the three objects orbit one another, observers will soon be able to perform the best-ever test of the "strong equivalence principle", which is a key prediction of Albert Einstein's general theory of relativity. #astrophysics
1915, Albert Einstein published his papers on General Relativity and the Equivalence Principle which were received with a great deal of skepticism. According to General Relativity, the gravitational attraction between masses results not from some hidden force but from the warping of space and time by those masses. He also said there was no such thing as "ether". And, he predicted from his theory that light from distant stars would be bent by the sun.