Explain how gravity is the major force in the formation of the planets, stars, and the solar system.
Earth and Space Sciences
Origin and Evolution of the Universe
Composition and Structure
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Describe how the planets change their position relative to the background of the stars.
Recognize the role of gravity as a force that pulls all things on or near the earth toward the center of the earth and in the formation of the solar system and the motions of objects in the solar system.
Explain how light, measured remotely, can be used to classify objects in the universe.
Compare and contrast the size, composition, and surface features of the planets that comprise the solar system as well as the objects orbiting them.
Explain why the planets orbit the sun in nearly circular paths.