银河系直径约16万光年，我们身处其中，是如何得知银河系全貌的？
Synopsis
如果有人问你银河系是什么样子，你肯定会回答是一个扁平的棒旋星系，直径大约在16万光年左右，因为在平时我们所看到的银河系 ...
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