Description
宇宙很大，它到底有多大呢？没有人知道，如果它有一个确定的大小，那肯定又会有下一个问题——宇宙外面有什么？根据现有的观测手段，宇宙年龄大约是138亿年，这是根据大爆炸宇宙学说结合普朗克卫星观测数据得到的一个结果。这个数字既代表着宇宙的年龄，也代表着在不同的理论模型下宇宙的空间尺度。不同的模型会得到不同的空间尺度数值。
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