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　　In trying to comprehend our universe, just how big is big? How far is far? This users guide to the cosmos will bring the incomprehensible down to a human scale such as Venus melting a tank, the density of a black hole compared to 1000 cars in a Coke can, and the comets in the Solar System equated to grains of sugar weighing half a ton.更多《美国A片》完整版高清在线点播、美国A片在线观看高清完整版视频、美国A片在线高清观看免费相关欧美综艺资源，请持续关注天光主影!