原题
The observational study of galaxies has significantly advanced our understanding of the universe. By analyzing t light emi from cele bodies, li stars, astro can in various prope such a distance fr Earth, compo, and velocity. As light from galaxies travels through space, it stretches, shifting to the red end of the spectrum. This shift is directly proportional to a galaxy's speed and distance, allowing scientists to map the universe's expansion.
参考答案：he tted stial ke nomers fer rties s om sition
解题思路
老师暂未填写解题思路。