sentences: as the mass of a celestial object decreases , the surface gravity of that celestial object weakens & the space has more want than the sun ->  the surface gravity on earth is greater than the surface gravity on the moon  the surface gravity on earth is greater than the surface gravity on the moon & as the willingly of levity increase , the lighten of the preposition will increase & surface gravity is a kind of force of gravity -> objects on earth will weigh more than the objects on the moon because the surface gravity on earth is greater than on the moon objects on earth will weigh more than the objects on the moon because the surface gravity on earth is greater than on the moon  objects on earth will weigh more than the objects on the moon because the surface gravity on earth is greater than on the moon & more is the synonym of more & an astronaut is a kind of object -> an astronaut will weigh more on earth because the surface gravity on the moon is less than the surface gravity on the earth