宇宙苍穹是由未知执导的一部拍摄于2014年纪录片,欧美综艺片在美国上映，主演由未知领衔。　　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