当第一次用望远镜观测到火星时，人们从飞机上看到，火星的圆形圆盘在地球上纵横交错。
When the planet Mars was first observed through a telescope, people saw that the round disk of the planet was criss-crossed on earth that are viewed from an airplane.
研究学者认为，我们的月球是在一个巨大如火星的物体撞击地球时形成的，碰撞产生圆形的碎屑沿着地球轨道飞行。
Researchers believe that our moon was created when a giant object the size of Mars hit the early Earth, sending out a disc of debris orbiting our planet.
火星表面细节显示了地球的瑞士奶酪般的圆形洼地。
Surface details of Mars showing the planet's Swiss cheese-like circular depressions.
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