宇宙苍穹2.0

　　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 d魔窟百度影音own to a human scale such as Venus melting a t男人的命根子ank, 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.