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. 宇宙的基础知识，适合普及用。$睡前刷着玩$看过【宇宙】的一部纪录片，是探索频道的，叫Cosmos，不知道是不是这部，很通俗易懂，从太阳系到【外族星系】，一直到整个宇宙，介绍的很详细，我当时还买了影碟。现在想起来，真是天文科普的好时光啊，呵呵。。。$我在电视上看的，感觉像青少年科普片儿
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