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지구는 다른 행성에 비하면 적도 부분의 돌출이 미미한 편이지만, 원심력과 지구 중심...zdnet.co.kr 2024-10-03
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북극성은 4일 주기로 밝아지고 어두워지는데 별의 밝기가 변하는 세페이드형 변광성은 천체까지의 정확한 거리를 알려주...zdnet.co.kr 2024-08-22
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크기는 일반적으로 10만 광년(약 9.5조㎞)이다. 1광년은 빛의 1년 이동www.viva100.com 2023-07-22
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