Last Updated：2025/11/21
Sentence
科学者たちは、観測可能な宇宙に存在する星の数をおよそ千兆（10^15）個と推定しており、その数は気が遠くなるほど大きい。
Quizzes for review
Scientists estimate there are approximately one billiard stars in the observable universe, a mind-boggling figure.
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Scientists estimate there are approximately one billiard stars in the observable universe, a mind-boggling figure.
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