很早以前，人们就沉迷于地球之外存在生命的想法。
Since early times, people have been fascinated with the idea of life existing somewhere else besides earth.
几十年来，在地球之外寻找智慧生命或任何生命的竞争一直是一场激烈的空间争夺战。
The race to find intelligent life, or any life at all, beyond Earth has been a heated space scramble for decades.
火星是离太阳第四远的行星，也是地球之外的下一个行星。
Mars is the fourth planet from the Sun and the next planet beyond the Earth.
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