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剧情：
In trying to comprehend our universe, just how b775meig is big? How far is far? This users guide to the cosmos will bring the incomprehen哒哒兔sible down to a human scale such as Venus melting a tank, the density of a black hole compared to 1000偏偏喜欢你剧情 cars in a Coke can, and the comets in the Solar System equated to grains of sugar weighing half a ton.
