![宇宙苍穹](https://edu-image.nosdn.127.net/3A272180140471FA67B23BA3EC531D2C.gif)
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.
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已完结
![](https://edu-image.nosdn.127.net/3A272180140471FA67B23BA3EC531D2C.gif)