감마선의 시사

과학동아 1988년 05호

its gravitational intensity grows larger without limit. Things can fall into such a collapsed star, but nothing can battle its gravitation and emerge, so it's like an infinitely deep hole in space. Not even light get out, so it is a black hole. But do black holes actually exist? The centers of many galaxies give off energetic radiation in huge quantities, and the easiest way of explaining ...