摘要
黑洞是存在于宇宙空间中的一种天体。黑洞的引力极其强大,任何物质和辐射都会被吸入其中,连光线也无法逃脱。故而,"黑洞是时空曲率大到连光都无法从其事件视界逃脱的天体"。Could life exist on a planet orbiting a supermassive black hole?And if so,what would existence on such a planet be like?In fact,there is some danger if you live close to a black hole.
