一张图告诉你宇宙到底有多大
http://img6.cache.netease.com/cnews/2014/11/26/2014112613244655438.jpghttp://img2.cache.netease.com/cnews/2014/11/26/2014112613271812c98.jpghttp://img1.cache.netease.com/cnews/2014/11/26/201411261327563bfb4.jpghttp://img2.cache.netease.com/cnews/2014/11/26/20141126132836cda26.jpghttp://img6.cache.netease.com/cnews/2014/11/26/201411261329196f409.jpg宇宙究竟有多大？慢慢来看这张图吧！（图片来自网络）
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