
NASA @NASA
What do Albert Einstein, GPS, & a pair of stars 200,000 trillion miles away have in common? An effect called the "gravitational redshift” from Einstein’s General Theory of Relativity. Using @ChandraXray, astronomers discovered the phenomenon in two stars: https://t.co/fsYYh2iKj9 https://t.co/nol8Xqjxwr — PolitiTweet.org