Sidereal age, the distance between they and earth, it is the conclusion that astronomy wants scrupulous to reach.

恒星的年龄，它们与地球之间的距离，都是天文学要一板一眼得出的结论。

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Sidereal age, the distance between they and earth, it is the conclusion that astronomy wants scrupulous to reach.

恒星的年龄，它们与地球之间的距离，都是天文学要一板一眼得出的结论。

youdao