Gravity - Force of attraction that keeps all objects in orbit., Inner planets - Known as the terrestrial planets, these 4 planets have a similar soil composition., Outer planets - Know as the "gas giants", these planets all have many moons and rings., Meteorites - Fragments of space material that land on Earth’s surface., Comet - Frozen ice and rock that travels toward the center of the solar system., Asteroids - Pieces of rock made of minerals similar to those that formed the rocky planets and moon., Solar System - Made up of planets, the Sun and other orbiting objects., Galaxy - Group of stars, gas, and dust held together by gravity., Universe - Many galaxies.,

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