关键词：宇宙苍穹 big dens will tank melting Venus
In trying to comprehend our universe, just how big is big? How far is far? Thi 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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