It doesn't have much of an atmosphere, but there is a trace of one, mostly due to its magnetic field trapping the solar wind, and to material flung up from the surface after violent impacts from comets and asteroids.
水星上基本上没有大气层,但有一些大气的痕迹,主要是磁场捕捉到太阳风,以及彗星和小行星猛烈撞击后抛
的物质。