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Chapter 21

Our Solar System

TermDefinition
Asteroid a small, solid, rocky body that orbits the Sun
Astronomical unit Earth's average distance from the Sun, which is approximately 150 million kilometers
Comet a body that produces a coma of gas and dust
Ellipse an oval or flattened circle
Gas giant a large planet that consists mostly of gasses in a dense form
Meteor a brief streak of light produced by a small particle entering Earth's atmosphere at a high speed
Meteorite a small object from outer space that passes through Earth's atmosphere and reaches the surface
Ring in astronomy, a wide, flat zone of small particles that orbit around a planet's equator
Tectonics the process in which the motion of hot material under a crust changes the crust of a space body
Terrestrial planet Earth or a planet similar to Earth that has a rocky surface
Volcanism the process of molten material moving from a space body's hot interior onto its surface
Created by: avaught
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