Last Updated：2025/11/28
Sentence
天文学者たちはいくつかのケフェイド変光星の絶対等級を比較して、それらの距離を求めた。
Quizzes for review
Astronomers compared the absolute magnitudes of several Cepheid variables to determine their distances.
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Astronomers compared the absolute magnitudes of several Cepheid variables to determine their distances.
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