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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《重生开心农场》免费完整版在线播放、重生开心农场完整版免费、重生开心农场在线播放免费相关欧美综艺资源，请持续关注天光主影!