Mars' global magnetic field shut down around 4.2 billion years ago, and from there the solar wind and powerful sun explosions stripped away most the atmosphere, sending it off into space.

火星的全球磁场在大约 42 亿年前关闭，从那时起， 太阳风和强大的太阳爆炸剥离了大部分大气层，将其送入太空。