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Ch 20 Astronomy

A Family of Planets

WordDefinition
astronomical unit (AU) the average distance between the Earth and the sun, or approximately 150,000,000 km
terrestrial planets the small, dense, rocky planets of the inner solar system
prograde rotation the counter-clockwise spin of a planet or moon as seen from above the planet's north pole
retrograde rotation the clockwise spin of a planet or moon as seen from above the planet's north pole
gas gaints the large, gaseous planets of the outer solar system
satellite a natural or artifical body that revolves around a planet
phases the different appearance of the moon due to varying amounts of sunlight on the side of the moon that faces the Earth
eclipse an event in which the shadow of one celestial body falls on another
comet a small body of ice, rock, and cosmic dust loosely packed together that gives off gas and dust in the form of a tail as it passes close to the sun
asteroid a small, rocky body that revolves around the sun
asteroid belt the region of the solar system most asteroids occupy
meteoroid a very small, rocky body that revolves around the sun
meterorite a meteoroid that reaches the Earth's surface without burning up completely
meteor a streak of light caused when a meteoroid or comet dust burns up int he Earth's atmosphere before it reaches the ground
Created by: mfender
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