宇宙虛空
夫宇宙之中，有虛空之處。其中或不載列宿，或鮮有星系。物質疏甚，緻密不及他處之什一。考其直徑，長短不一。短者百一十萬秒差距。長者千五百萬秒差距。秒差距，所以度三維者也。一秒差距，三又什四光年也。虛空之閎者，是為極虛空。四宇逾密，虛空益寡。物質稀疏，虛空愈溥。
虛空之大者
- 牧夫座虛空
- 摩羯座虛空
- 南本極虛空
- 北本極虛空
據
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