从该星系中心接收到的无线电信号证实了黑洞理论。
Radio signals received from the galaxy's centre back up the black hole theory.
只有拥有球形膨胀物质的星系才可能容纳超大质量的黑洞。
Only galaxies with a spherical bulge—like component appear to accommodate supermassive black holes.
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。
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.
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