KEY TERMS

• • Gravity field

    All objects with mass have gravity, which is a force of attraction between the object and all others in the universe. The more mass, or material, an object has, the more powerful its gravity. The gravity field of an object (Jupiter, for example) is the three-dimensional region of space around it in which the force of its gravity has a measurable influence. Unless an object is perfectly spherical, its gravity field will have variations in strength at different places that are related to how material within it is arranged.