人类开始研究天空时,看到了很多.宇宙中,地球像尘土一样渺小.它只是一个绕太阳运转的小行星.太阳带着它的行星,在我们的星系,银河系中运行.银河系有约30亿个像太阳一样的恒星,而且它只是宇宙中几亿星系之一.因为宇宙空间广阔,所以很难计算出星星们距我们有多远.我们用光年来代替千米这一单位.1光年就是光在一年中走的路程.距地球最近的星系也有超过900,000 光年之遥. 打的我好辛苦、、、、我初四,答案仅供参考,谢谢!
英语翻译When man began to search the sky,he saw a lot of things.
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