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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Flatness (cosmology) ： ウィキペディア英語版 Flatness (cosmology) The concept of "curvature of space" is fundamental to cosmology. A space without curvature is called a "flat space" or Euclidean space. Whether the universe is “flat″ could determine its ultimate fate; whether it will expand forever, or ultimately collapse back into itself. The geometry of spacetime has been measured by the Wilkinson Microwave Anisotropy Probe (WMAP) to be nearly flat. According to the WMAP 5-year results and analysis, “WMAP determined that the universe is flat, from which it follows that the mean energy density in the universe is equal to the critical density (within a 1% margin of error). This is equivalent to a mass density of 9.9 × 10−30 g/cm3, which is equivalent to only 5.9 protons per cubic meter.”〔(NASA:Wilkinson Microwave Anisotropy Probe:Cosmology, The Study of the Universe )〕 The WMAP data are consistent with a flat geometry, with Ω = 1.02 +/- 0.02. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Flatness (cosmology)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.