中文名称 星系自转 英文名称 galacticrotation
一个让我们相信暗物质存在的理由是,如果暗物质不存在的话,星系照现在的速度自转,它们早就分崩离析了,但是对此也无定论。
One reason to believe dark matter exists is that galaxies rotate at such speeds that they would fly apart without it, or so the argument goes.
科学家们指出,多数脉冲星是双星系统的一部分,自转速度不到20毫秒一周,但是大约30%的脉冲星没有任何伴星。
Most of the pulsars that spin faster than once per 20 milliseconds are part of a binary star system, but about 30% have no companions whatsoever, the scientists note.
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