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词汇 Cosmological redshift
分类 英语词汇 英语翻译词典
释义

Cosmological redshift

原声例句
Crash Course 天文篇

When light loses energy its wavelength gets longer — that's what cosmological redshift is.

当光失去能量，它的波长会变长，这就是宇宙学的红移。

Crash Course Physics 速成课物理

And this trend of distant galaxies moving away from us, and from one another, is called cosmological redshift.

这种遥远星系 远离我们、彼此远离的趋势被称为 宇宙学红移。

中文百科

哈柏定律 Hubble's law

（重定向自Cosmological redshift）
宇宙的最终命运和宇宙的年龄，可以取决于测量现今的哈伯常数和推断减速参数的观测值，此参数特具密度参数值（Ω）的特征。所谓的「封闭宇宙」（Ω＞1）即将在一次「大紧缩」（Big Crunch）后结束，比哈伯年龄年轻。「开放宇宙」（Ω≦1）永远都在扩张且具有较接近哈伯年龄的年龄。我们所居住的宇宙为「加速宇宙」（accelerating universe），其年龄正巧非常接近哈伯年龄。

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，v 是由红移现象测得的星系远离速率，H_0 是哈伯常数，D是星系与观察者之间的距离。

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Cosmological redshift）
Full-sky image derived from nine years' WMAP data
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]
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]
The age and ultimate fate of the universe can be determined by measuring the Hubble constant today and extrapolating with the observed value of the deceleration parameter, uniquely characterized by values of density parameters (ΩM for matter and ΩΛ for dark energy). A

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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