| 单词 | Hubble parameter |
| 释义 |
Hubble parameter
原声例句
Crash Course 综合篇 The equation uses a proportionality constant called the Hubble parameter, which says that for every million light-years of distance from us, a galaxy is moving away at an additional 21 kilometers per second. 该方程式使用一个称为哈勃参数的比例常数，它表示距离我们每百万光年的距离， 一个星系以每秒 21 公里的额外速度移动。
中文百科
哈柏定律 Hubble's law（重定向自Hubble parameter）
 在物理宇宙学里，哈伯定律（Hubble's law）表明，来自遥远星系光线的红移与它们的距离成正比。这条定律是因证实者哈伯而命名。它被认为是空间尺度扩展（metric expansion of space）的第一个观察依据，和今天经常被援引作为支持大爆炸的一个重要证据。 在宇宙学研究中，哈伯定律成为宇宙膨胀理论的基础，以方程序表示 其中， 2012年12月20日，美国国家航空暨太空总署的威尔金森微波各向异性探测器实验团队宣布，哈伯常数为69.32 ± 0.80 (km/s)/Mpc。
英语百科
Hubble's law 哈柏定律（重定向自Hubble parameter）
 ![Fit of redshift velocities to Hubble's law.[30] Various estimates for the Hubble constant exist. The HST Key H0 Group fitted type Ia supernovae for redshifts between 0.01 and 0.1 to find that H0 = 71 ± 2 (statistical) ± 6 (systematic) km s−1Mpc−1,[24] while Sandage et al. find H0 = 62.3 ± 1.3 (statistical) ± 5 (systematic) km s−1Mpc−1.[31]](/uploads/202501/18/Hubble_constant3944.JPG) ![A variety of possible recessional velocity vs. redshift functions including the simple linear relation v = cz; a variety of possible shapes from theories related to general relativity; and a curve that does not permit speeds faster than light in accordance with special relativity. All curves are linear at low redshifts. See Davis and Lineweaver.[36]](/uploads/202501/18/Velocity-redshift3944.JPG)  Hubble's law is the name for the observation in physical cosmology that: Hubble's law is considered the first observational basis for the expansion of the universe and today serves as one of the pieces of evidence most often cited in support of the Big Bang model. The motion of astronomical objects due solely to this expansion is known as the Hubble flow. |
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是由红移现象测得的星系远离速率，
是哈伯常数，
是星系与观察者之间的距离。