Einstein's Theory of General Relativity Used to Weigh Star

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The Hubble Space Telescope was used to observe white dwarf star Stein 2051 as it passed in front of a distant star. The phenomena of gravitational microlensing, predicted by Albert Einstein's theory, offset the light coming from the distant star and a measurement of the white dwarf's mass was deduced.
Credit: Space.com / produced and edited by Steve Spaleta