In a galaxy far away, an old star exploded and became a supernova. About 170 million years later, the light emanating from a few of those stars ending their long lives in dramatic explosions was observed by an arsenal of telescopes here at Earth. More: https://t.co/Dp07I6Y34G pic.twitter.com/N2Zixo8Zdz

— NASA (@NASA) November 30, 2018