chapter 21
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| the average distance between the Earth and the sun;approximately 150 million kilometers (symol, AU) | astronomical unit
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| one of the highly dense planets nearest to the sun; Mercury, Venus, Mars, and Earth | terrestrial planet
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| 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`
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| the clockwise spin of a planet or moon as seen from above the planet's North Pole | retograde rotation
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| a planet that has a deep, massive atmosphere, such as Jupiter, Saturn, Uranus, or Neptune | gas giant
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| a natural or artificial body that revolves around a planet | satellite
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| the change in the sunlit area of one celestial body falls on another | phase
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| an event in which the shadow of on e celestial body falls on another | eclipse
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| 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
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| a small, rocky object that orbits the sun, usually in a band between the orbits of Mars and Jupiter | asteroid
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| the region of the solar system that is between the orbits of Mars and Jupiter and in which most asteroids orbit | asteroid belt
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| a relatively small, rocky body that travels through space | meteoroid
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| a meteoroid that reaches the Earth's surface without burning up completely | meteor
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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