In reviewing the surface of Mars it appears that it has been pelted by numerous meteors and small asteroids. My initial question is; is it possible that the atmosphere of Mars at one time ceased to exist thus resulting in many hits of various sizes to the surface of the planet causing this visible damage/extinction? These missiles were unable to be burned up much as they are today on Earth. On another note, is it now possible that the atmosphere has "re-formed" and explains why there is a realtively thin one today? It is known that we are slowly destroying Earth's atmosphere, could we be heading in the same direction as fateful Mars?