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《亚洲精品欧美精品日韩精品秋霞午夜一区二区三区黄瓜视频》完整版在线播放、亚洲精品欧美精品日韩精品秋霞午夜一区二区三区黄瓜视频免费观看高清在线、亚洲精品欧美精品日韩精品秋霞午夜一区二区三区黄瓜视频完整版全集免费观看相关欧美综艺资源，请持续关注网魅乐影视!