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《大沢佑香 黑人》高清完整免费、大沢佑香 黑人在线播放完整、大沢佑香 黑人免费在线观看相关欧美综艺资源，请持续关注小智乐影视在线!