黑洞很容易让人想像成一个“黑窟窿”,其实它和地球、太阳一样,都是一种天体。黑洞概念最早由爱因斯坦提出。当一颗恒星衰老时,它的内部能量耗尽,核心开始塌陷、缩小,最后形成体积小、密度大的星体。巨大的引力使得处于引力场的任何物质都向恒星中心靠近,即使光也无法“逃出去 Black hole is easy to imagine as a “black hole”, in fact, it and the Earth, the sun, are a celestial body. The concept of black hole was first proposed by Einstein. When a star decays, its internal energy is exhausted, the core begins to collapse and shrink, finally forming a small, dense star. Huge gravitation forces any matter in the gravitational field toward the center of the star, even if the light can not "escape