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》在线高清观看免费、老爸老妈浪漫史第一季在线观看高清免费观看、老爸老妈浪漫史第一季在线观看电影免费观看相关欧美综艺资源，请持续关注小智乐影视在线!