Seyfert galaxies are energetic because they have a central black hole surrounded by a ring of gas.
赛非星系能量巨大，因为在其中心有-一黑洞，黑洞周围则环绕着环状星云。
At the center of the starburst rings is the Seyfert nucleus, the believed signature of a supermassive black hole that is accreting surrounding gas and dust.
人们相信，在赛费特星系的中心，存在黑洞，依据就是环绕着星系的气体和灰尘。
Caption: a face-on snapshot of the small spiral galaxy NGC 7742, not just any old spiral galaxy but a Seyfert 2 - a galaxy that is probably powered by a black hole at its core.
描述：小螺旋星系ngc 7742正向快照，不只是古老的螺旋星系而是2型塞弗特星系——其动力可能由星系核心处的黑洞提供。
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