There is no such thing as "weight of gravity", and thegravitational field is not expressed in newtons.The gravitationalfield is expressed in meters per second squared, which isequivalent to newtons per kilogram. That means that a more massiveobject will weigh more.Earth's gravitational field (at the surface) is about 9.8newtons/kilogram.The gravitational field of Mars (at the surface) is about 3.7newtons/kilogram.