as the mass of a celestial object decreases , the surface gravity of that celestial object weakens & the earth has more mass than the moon ->  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 force of gravity decreases , the weight of the object will decrease & 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 & less is the opposite 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