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Astronomy Vocab 13

Astronomy vocab

Terrestrial Planet One of the higher dense planets nearest to the sun; Mercury, Venus, Earth, or 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 km. symbol, A.U.
Revolution The motion of a body that travels around another body in space; one complete trip around 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
Oort Coud A spherical region that surrounds the solar system, that extends from the Kuiper Belt to almost halfway to the nearest star, and that contains billions of comets
Kuiper Belt A region of the solar system that is just beyond the orbit of Neptune and that contains small bodies made mostly of ice
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 gasses
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 object 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 reaches Earth's surface without burning up completely
Prograde rotation When the planet is spinning forward instead of backwards
Retrograde Rotation When the planet is rotating backward instead of forwards
Solar System The sun and all the planets and other bodies that orbit around it
Created by: rachel160