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Vocabulary Lesson 1 Solar system: includes all of the planets, moon, and other objects that revolve around a star. Planet: a large space object that moves in a curved path around a star Inner planets: closest to the sun, small and made up of mainly rock and metal Outer planets: they are further from the sun, large and made up mainly of light gases and ices Astronomers: scientists who study the universe Moon: a natural object that revolves around a planet (are called satellites) Asteroids: large pieces of space rock with irregular shapes most found in asteroid belt between mars and Jupiter Comets: bodies made up of ice, dust and small, gritty particles ice turns to gas, producing a spectacular streak often called a tail Meteoroids: pieces of rock or dust that are smaller than asteroids Meteors: pieces of rock or dust that burn up before they land on Earth also called shooting stars Meteorites: are pieces of rock that land on the Earth Revolution: the movement of a body in space around another body Orbit: the path that a revolving body takes Rotation: the movement of a space object turning on its own axis Axis: an imaginary line that runs through the center of a planet or another body Lesson 2 Atmosphere: a blanket of gases that surrounds a planet