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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 Recessional velocity ： ウィキペディア英語版 Recessional velocity Recessional velocity is the rate at which an object is moving away, typically from Earth. ==Application to cosmology== Recessional velocity is most pertinent to distant galaxies, which (due to Hubble's Law) redshift proportionally to their distance from the Earth. The redshift is usually interpreted as due to recessional velocity, which can be calculated according to the formula: :$v\; =\; H\_0\; D\backslash$ where $H\_0$ is the Hubble constant, $D$ is the intervening distance, and $v$ is the recessional velocity, generally measured in km/s. The recessional velocity of a galaxy is usually calculated from the redshift observed in its emitted electromagnetic radiation. The distance to the galaxy is then estimated using Hubble's Law. Since the distance is constantly increasing, the recession velocity is also increasing in magnitude. Therefore, "recession velocity" is a misnomer; more properly, this phenomena should be referred to as the recession acceleration. 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「Recessional velocity」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.