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1995.7.2『车轮星系』#APOD历史存档#
车轮星系明亮的光环是一次小星系和大星系撞击的结果。当一个小星系在穿越一个大星系的过程中,可能就像我们的银河系一样,一个恒星孕育的能量从撞击点像涟漪一样扩散开来。当两个星系相撞的时候,两个恒星撞击的情况是十分稀有的。然而重力导致密度波穿过星系从而引发新的明亮炙热的恒星的孕育,形成了图中看到的光环。
The Cartwheel Galaxy shows a ring that is the result of a collision between a small and a large galaxy. After a small galaxy has moved through a big galaxy - in this case one that probably resembled our own Milky Way - a star formation wave moves out from the impact point like ripples across the surface of a pond. When galaxies collide it is rare that any two stars actually collide. Gravity, however, causes density waves to move out through the galaxy which in turn triggers the formation of hot, bright young stars, producing the ring that we see in this picture.
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