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OBJECTIVE S Identify planets by observing their movement against background stars. Explain that the solar system consists of many bodies held together by gravity. MAIN IDEA The solar system consists of the planets, their moons, and many other bodies orbiting the Sun. VOCABULA RY planet moon solar system inertia asteroid comet meteoroid meteor meteorite WHAT IS THE SOLAR SYSTEM? • Before telescopes were invented people studied stars by looking up at the night sky. • People noticed the bright lights in the sky changed. • A solar system has stars like the sun as well as moons and planets. • All but 2 planets have one or more than one moon.
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