而且占了银河系大部分重量的是无形的暗物质，人们之所以能发现暗物质是因为它的引力暴露了身份。
Plus, most of the galaxy's heft is in invisible dark matter, which betrays its presence only through its gravitational pull.
而且占了银河系大部分重量的是无形的暗物质，人们之所以能发现暗物质是因为它的引力暴露了身份。
Plus, most of the galaxy's heft is in invisible dark matter, which betrays its presence only through its gravitational pull.
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