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《老爸老妈浪漫史第一季在线观看》免费高清点播、老爸老妈浪漫史第一季在线观看完整版无删减、老爸老妈浪漫史第一季在线观看免费观看高清在线相关欧美综艺资源，请持续关注小智乐影视在线!