Although most galaxies have a central black hole, it is a small fraction of the galaxy's mass.
虽然大多数星系中心都有一个黑洞,但只占了星系总质量的一小部分。
We now know that the Milky Way is but one of many galaxies scattered throughout the Universe.
我们现在知道,银河只是宇宙各处散布的众多银河中的一个。
In some simulations, the stars spread along a full orbit around the galactic center.
在一些模拟中,恒星分散在整个围绕星系中心的轨道上。
The Jupiter-like planet, they say, is part of a solar system which once belonged to a dwarf galaxy.
他们说这颗类似木星的行星是某个恒星系统的一部分,这个恒星系统曾属于某个矮星系。
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