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《亚洲国产精品久久久就秋霞》在线高清观看免费、亚洲国产精品久久久就秋霞高清完整版在线、亚洲国产精品久久久就秋霞完整版高清在线点播相关欧美综艺资源，请持续关注时刻影院!