In trying to comprehend our universe, just how b@4399电影免费观看@ig 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 ho@演员张瑶@le compared to 1000 cars in a Coke can, and the comets in the Solar System equated to gra@天灵地宝@ins of sugar weighing half a ton.
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