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《这里只有精品最精视频全部免费观看》完整版免费、这里只有精品最精视频全部免费观看中文完整版、这里只有精品最精视频全部免费观看中字免费在线播放相关欧美综艺资源，请持续关注CPP阳光影视!