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研究宇宙的起源与演化,是天文学的重要任务之一。20世纪中叶,一些著名的天文学家认为,宇宙起源于137±2亿年前的一次大爆炸。大爆炸后,整个宇宙不断膨胀,星系整体退行。各个方向上的星系都在飞快地离我们远去,离我们越远的星系退行速度越大。由于多普勒效应,我们接收到离我们远去的星系发射的电磁波,频率会降低,也就是其发射光谱向长波(红光)方向移动,天文学上称之为“红移”。离我们越远的星系,退行速度越大,产生的红移越高。遥远的、
Studying the origin and evolution of the universe is one of the important tasks of astronomy. By the middle of the 20th century, some prominent astronomers thought the universe originated from a big bang of 137 ± 200 million years ago. After the big bang, the entire universe is constantly expanding and the entire galaxy retreats. The galaxies in all directions are fast moving away from us, the farther away from us the greater the speed of retrograde galaxies. Due to the Doppler effect, we receive electromagnetic waves emitted by galaxies that are far away from us, and their frequency decreases. That is, their emission spectrum moves toward the longwave (red) direction, which is astronomically called “redshift.” The farther away from us galaxies, the greater the retrograde speed, the higher the redshift generated. Far away,