Description
光晕是一个围绕银河系的球状区域，主要组成部分是暗物质。暗物质之所以“暗”是因为它不会发出任何电磁辐射，所以暗物质只能通过引力相互作用来研究。暗物质，特别是光在经过暗物质时会像通过凸透镜一样发生弯曲，这就是“引力透镜”效应。
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