Classifying the stars has helped materially in all studies of the structure of the universe.
对恒星进行分类对所有有关宇宙结构的研究都有重要的帮助。
-- Annie Jump Cannon 安妮跳大炮
Classifying the stars has helped materially in all studies of the structure of the universe.
对恒星进行分类对所有有关宇宙结构的研究都有重要的帮助。
-- Annie Jump Cannon 安妮跳大炮