블랙홀 가까이 다가간 별을 관측하는 GRAVITY 2016.06.28. 19:40 (This artist's impression shows stars orbiting the supermassive black hole at the center of the Milky Way. In 2018 one of these stars, S2, will pass very close to the black hole and this event will be the best opportunity to study the effects of very strong gravity and test the predictions of Einstein'..