A black hole, like theone in Centaurus A, is formed when a massive star collapses from itsown gravity. The pull of gravity is so strong that not even light canescape.

• 黑洞；像在半人马座A星系的这一个；是当一个质量大的恒星因为自己的引力而塌缩后形成.；此引力强大得连光线都无法逃逸