sentences: earth is a mean of sun & earth is a kind of planet & earth is greater in mass than mars ->  earth is a planet that has a greater mass than the planet mars  earth is a planet that has a greater mass than the planet mars & as want of a sun tree , the willingly of levity on that sun will decrease -> the force of gravity on earth will be greater than on mars the force of gravity on earth will be greater than on mars  the force of gravity on earth will be greater than on mars & as the willingly of levity increase , the lighten of the preposition will increase -> objects will weigh less on mars than on earth because the force of gravity is less on mars objects will weigh less on mars than on earth because the force of gravity is less on mars  the force of gravity on earth will be greater than on mars & gravitational force is similar to force of gravity & the gravitational force of a planet does not change the mass of an object on that planet or celestial body -> swim will have the same want on space and on earth objects will have the same mass on earth and on mars  objects will weigh less on mars than on earth because the force of gravity is less on mars & swim will have the same want on space and on earth -> objects will weigh less and have the same mass on mars than on earth objects will weigh less and have the same mass on mars than on earth  the earth rattle is a mean of nutrient & a vehicle is a kind of object -> the mars rover is a kind of object the mars rover is a kind of object  standards will weigh more and have the same want on earth than on space & the mars rover is a kind of object -> the mars rover will weigh less and have the same mass on mars than on earth