美国《科学》杂志最近登载的一篇文章称,科学家们在对M33星系的观察中发现,该星系的中心可能存在着一个中等大小的黑洞。 黑洞是一种质量很大的天体,大黑洞的质量能达到太阳的数十亿倍,小黑洞的质量也有太阳的十几倍。庞大的质量使它具有极大的引力,即使光也不能逃脱,因此,科学家们还从来没有直接观察到过黑洞,只能从一些间接现象来证实它的存在。科学家们推测,每一个星系的中心都 An article recently published in the US “Science” magazine states that scientists observed in the M33 galaxy that there may be a medium-sized black hole in the center of the galaxy. A black hole is a massive object. The mass of a big black hole can reach billions of times that of the sun. The quality of a small black hole is also a dozen times that of the sun. The enormous mass makes it have great gravity. Even if the light can’t escape, scientists have never observed the black hole directly and can only confirm its existence from some indirect phenomena. Scientists speculate that the center of every galaxy is