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大家都知道,宇宙中只存在一个地球,但是不久的将来,可能会出现另一个新地球,接着又出现一个。人类用了数千年的时间来研究地球,又用了几个世纪去探索与地球相邻的行星,宇宙视野一直在拓展。至
Everyone knows that there is only one earth in the universe, but in the near future another new earth may appear, followed by another. It took thousands of years for mankind to study the earth and for centuries to explore the planets that neighbor the earth. The universal horizon has been expanding. to