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摘要

Diagrams of three possible geometries of the universe: closed, open and flat from top to bottom, corresponding to a density parameter which is greater than, less than or equal to 1. The closed universe is of finite size and, due to its curvature, traveling far enough in one direction will lead back to one's starting point. The open and flat universes are infinite and traveling in a constant direction will never lead to the same point.

Source: https://wmap.gsfc.nasa.gov/universe/uni_shape.html Author: NASA / WMAP Science Team

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Public domain 本文件完全由NASA创作,在美国属于公有领域。根据NASA的版权方针,NASA的材料除非另有声明否则不受版权保护。(参见Template:PD-USGov/zhNASA版权方针页面JPL图片使用方针。)
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date/time username edit summary
04:52, 6 January 2006 en:User:Voyajer (Permission of NASA Official: Gary Hinshaw)

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当前2006年3月20日 (一) 17:212006年3月20日 (一) 17:21版本的缩略图557 × 501(52 KB)MaksimLa bildo estas kopiita de wikipedia:en. La originala priskribo estas: == Summary == Permission of NASA Official: Gary Hinshaw == Licensing == {{PD-USGov}} {| border="1" ! date/time || username || edit summary |---- | 04:52, 6 January 2006 || [[:en:User:

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