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在宇宙中，没有什么东西能够完全绝对静止下来，小到原子、电子，大到行星、恒星以及星系。我们所在的银河系也不例外，它也在宇宙中不断运动，并且相对于一个坐标系在快速运动，速度高达630公里/秒，将近230万公里/小时。那么，天文学家如何知道银河系在星系际空间中高速运动？银河系最终会去往何方呢？
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