可觀測宇宙
参考资料

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↑  Gott等人的宇宙地圖 （页面存档备份，存于）的第8頁中計算了未來視界的同移距離是哈伯半徑的4.5倍，給出值為42.2億秒差距（137.6億光年），在第7頁中計算了可觀測宇宙的當前同移半徑是哈伯半徑的3.38倍。在給定同移半徑的球體中的星系數量和半徑的立方是成正比的，因此未來視界的可觀測星系數量和當前可觀測星系數量的比率為(4.50/3.38)3 = 2.36。
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藝術家對可觀測宇宙的對數尺度構想，以太陽為中心，朝外是太陽系內行星和外行星，古柏帶，奧爾特雲，南門二，獵戶臂，銀河系，仙女座星系，鄰近星系，宇宙纖維狀結構，宇宙微波輻射以及處在邊緣的不可見的大爆炸等離子體。
哈伯太空望遠镜拍摄的月球背后一小块区域深空图（其中最古老星光几乎等同宇宙的年龄）
這是對可觀測宇宙大小最普遍的誤解之一。儘管宇宙年齡是138億歲，但因為宇宙膨脹，到可觀測宇宙的邊緣並不是一百三十八億光年。圖為位於紐約市羅斯地球和空间中心的一塊牌匾。