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studystackscience
chapter 21
| Question | Answer |
|---|---|
| the average distance between the Earth and the sun;approximately 150 million kilometers (symol, AU) | astronomical unit |
| one of the highly dense planets nearest to the sun; Mercury, Venus, Mars, and Earth | terrestrial planet |
| the counterclockwise spin of a planets or moon as seen from above the planet's North Pole rotation in the same direction as the sun's rotation | prograde rotation` |
| the clockwise spin of a planet or moon as seen from above the planet's North Pole | retograde rotation |
| a planet that has a deep, massive atmosphere, such as Jupiter, Saturn, Uranus, or Neptune | gas giant |
| a natural or artificial body that revolves around a planet | satellite |
| the change in the sunlit area of one celestial body falls on another | phase |
| an event in which the shadow of on e celestial body falls on another | eclipse |
| a small body of ice, rock, and cosmic dust that follows an elloptical orbit around the sun and that gives off the gas and dust in the form of a tail as it passes close to the sun | comet |
| a small, rocky object that orbits the sun, usually in a band between the orbits of Mars and Jupiter | asteroid |
| the region of the solar system that is between the orbits of Mars and Jupiter and in which most asteroids orbit | asteroid belt |
| a relatively small, rocky body that travels through space | meteoroid |
| a meteoroid that reaches the Earth's surface without burning up completely | meteor |
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grecovictoria
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