《宇宙苍穹》综艺英语完整版高清全集百度云在线观看/迅雷下载,未删减版西瓜影音播放器在线播放。　　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.