Is it true that the earth's crust does a 180-degree rotation around the core in a matter of days if not hours?
地球的外壳将会在几天如果不是几小时之内的话围绕地心旋转180度的说法是真的吗？
That's because the backward rotation puts more space between the black hole and the orbiting matter, leaving more room for magnetic fields to build up, the study authors say.
研究报告的作者说，因为反向旋转在黑洞和沿轨道运行物质之间形成更大的空间，也就为磁场的形成留下了更多的空间。
To convert measurements of the Milky Way's rotation speed to mass, astronomers must rely on models of how dark matter is distributed in the galaxy.
要把银河系的转速转换成质量，天文学家要依靠模型，而这模型能显示暗物质在星系中是怎样被影响的。
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