Hello, My question is regarding effect of sun's gravity on earth. I want to know that if sun's gravity can change earth's landscape in long duration (i.e. billion of years ) or not?? Means if earth is dead planet and all other planets are not present in the solar system and earth is as near as sun as mercury currently orbiting. And also suppose earth's surface is not smooth (because of hitting with other small bodies at regular interval) then can earth's surface can be smooth in long duration by gravity of sun or not??