Was Mars a water world?

火星以前是水的世界吗？

youdao

This is an artist's concept of present-day Mars - a barren, cold, desert world.

这是现今火星的艺术概念图-一个贫瘠，冰冷，荒芜的世界。

youdao

This is an artist's concept of present-day Mars - a barren, cold, desert world.

这是现今火星的艺术概念图-一个贫瘠，冰冷，荒芜的世界。

youdao