sentences: as the mass of a celestial object decreases , the surface gravity of that celestial object weakens & as the force of gravity decreases , the weight of the object will decrease ->  as the mass of a celestial object decreases, the weight of an object on that celestial object will decrease  as the mass of a celestial object decreases, the weight of an object on that celestial object will decrease & the earth has more mass than the moon ->  an object weighs more on earth than on the moon because earth has more mass than the moon  an object weighs more on earth than on the moon because earth has more mass than the moon & less is the opposite of more ->  an object will weigh less on the moon than on the earth because the moon has less mass than the earth  an object will weigh less on the moon than on the earth because the moon has less mass than the earth & a hammer is a kind of object -> a hammer will weigh less on the moon than on earth becasue the moon has less mass than the earth