gravity - the attractive force between all objects that have mass, centripetal force - a force acting on a body traveling in a circular path that points toward the center of the cirecle, solar system - The system consisting of the sun and the objects that orbit it, comet - a ball of ice and rock that orbits the sun, asteroid belt - a region between the orbits of Mars and Jupiter where many asteroids orbit the sun, astronomical unit - the average distance between the sun and Earth, about 150,000,000 km, scaled model - a copy of an object that is smaller or larger than the actual object, planetesimal - a rocky body that forms the building blocks of planets, scientific theory - an explanation of how a natural phenomenon works, geologic time scale - the division of Earth's history into blocks of time,

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