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.如果只是单纯的(🎈)清理一片空地，利用电(diàn )球(qiú )是最好(🔡)(hǎo )的方法，就像之前(qián )建设部(bù )落中心(xīn )时，一记电球下去(🌋)，整片区域的树木都被炸焦。