宇宙年龄只有138亿年，为何可观测宇宙直径却长达930亿光年?！【太空科学站】
Synopsis
现如今天文学家告诉我们，宇宙大约诞生于138亿年前，其直径长达930亿光年，那么很多人可能都有所疑问，既然光速是恒定的， ...
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