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Terrestrial Planets One of the highly dense planets nearest to the sun; Mercury; Venus; Earth; Mars
Gas Giants a planet that has a deep, massive atmosphere, such as Jupiter, Saturn, Uranus, or Neptune
Astronomical Unit the average distance between Earth and the sun; approximately 150 million kilometers
Revolution the motion of a body that travels around another body in space; on complete trip along an orbit
Rotation the spin of a body on its axis
Dwarf Planet a celestial body that orbits the sun, is round because of its own gravity, but has not cleared its orbital path
Asteroid Belt the region of space between the orbit paths of Mars and Jupiter in which most asteroids are located
Kuiper Belt a disk-shaped region on the edge of the solar system that contains masses of ice and icy rock, supposed to be the source of comets
Oort Cloud a region of the solar system beyond the Kyper Belt in which billions of comets move in nearly circular orbits unless one is pulled into an elliptical orbit by a passing star.
Comet a small body that gives off gas and dust as it passes close to the sun; a typical comet moves in an elliptical orbit around the sun and is made of dust and frozen gases
Asteroid a small, rocky object that orbits the sun; most asteroids are located in a band between the orbits of mars and jupiter
Meteoroid a relatively small, rocky body that travels through space
Meteor a bright streak of light that results when a meteoroid burns up in earth's atmosphere
Meteorite a meteoroid that reached earth's surface without completely burning up
Prograde Rotation When a planet rotates on it's axis at a less than 90 degree angle clockwise
Retrograde Rotation When a planet rotates on its axis at a 90 or higher degree tilt or in a counter clockwise rotation
Solar System the sun and all of the planets and other bodies that travel around it
Created by: LilahB