But when we look out to space, over astronomical distances, to the stars, planets and galaxies beyond, then light's finite speed has profound consequences.
但当我们仰望天空观察远在天文距离之外的恒星 、行星和星系时,光速就会产生重大的影响。
单词 | Astronomical distances |
释义 |
Astronomical distances
原声例句
宇宙的奇迹 But when we look out to space, over astronomical distances, to the stars, planets and galaxies beyond, then light's finite speed has profound consequences. 但当我们仰望天空观察远在天文距离之外的恒星 、行星和星系时,光速就会产生重大的影响。 新概念英语.英音版.第四册(译文) But here we come up against the most difficult of all obstacles to contact with people on other planets -- the astronomical distances which separate us. 然而,在和外星人联系中我们遇到的最大困难是分隔我们的天文距离。
中文百科
距离测量 (宇宙学) Distance measures (cosmology)(重定向自Astronomical distances)
距离测量是使用在物理宇宙学给与在宇宙中的两个天体或事件的自然概念距离。它们通常使用一些受限制但可以观测的量 (像是遥远距离类星体的光度、远距离星系的红移、或在CMB能谱的声学峰值角尺度) 配合不能直接观测,但更方便于计算的量 (像是类星体、星系等的同移坐标)。此处讨论的距离测量都简化为在低红移下单纯概念的欧几里得度量距离。 与我们所了解的宇宙学一致,这些测量的计算都在符合广义相对论范围内的弗里德曼-勒梅特-罗伯逊-沃尔克解所用来描述的宇宙。
英语百科
Distance measures (cosmology) 距离测量 (宇宙学)(重定向自Astronomical distances)
![]() ![]() ![]() Distance measures are used in physical cosmology to give a natural notion of the distance between two objects or events in the universe. They are often used to tie some observable quantity (such as the luminosity of a distant quasar, the redshift of a distant galaxy, or the angular size of the acoustic peaks in the CMB power spectrum) to another quantity that is not directly observable, but is more convenient for calculations (such as the comoving coordinates of the quasar, galaxy, etc.). The distance measures discussed here all reduce to the common notion of Euclidean distance at low redshift. |
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