Complete the Words / 2
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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.
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参考答案：he tted stial ke nomers fer rties s om sition