Previous estimates of M87's black hole mass registered at some 3 billionsuns, still 1,000 times the size of the Milky Way's welterweight black hole.

原先估计M87星系的黑洞质量为太阳的3亿倍，仍然相当于银河系次中量级黑洞的1000倍。

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Most black hole mass seems to come from direct consumption (called accretion) of gas, indicating that a black hole needs a surrounding galaxy to grow.

大多数黑洞聚集物看起来是直接从气体(叫做冲击层)的消耗中间来的，这表明一个黑洞的成长需要周围有一个星系。

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Most astronomers believe that the large concentration of mass at the galaxy's center is a black hole whose gravity is causing the gas to whirl.

大多数天文学家认为，星系中心的大量物质是一个黑洞，它的引力导致气体旋转。

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"The fact that there's a very young cluster of stars indicates that the intermediate-mass black hole may have originated as the central black hole in a very low-mass dwarf galaxy, "Sean Farrell, of the Sydney Institute for Astronomy in Australia, said in a statement.

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In the galaxy NGC 1277, astronomers have discovered a black hole with the mass of 17 billion suns.

FORBES: Astronomers Find One Of The Biggest Supermassive Black Holes Yet

Ascertaining the binary nature of the system also allowed the astronomers to make their accurate measurement of the bigger black hole's mass.

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