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1
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a device that makes distant objects look larger and brighter
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2
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the movement of an object around another object; equals 1 year
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3
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large planets made mostly of gaseous and liquid substances; little or no solid surface
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4
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a natural or man-made object that revolves around another object in space
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5
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a natural force that pulls two or more objects toward each other
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6
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the North Star; lies almost exactly over the North Pole
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7
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a measurement equal to the distance that light travels in 1 year; about 6 trillion miles
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8
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a huge cloud of gas and dust in space
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9
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equal periods of day and night
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10
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the idea that the planets revolve around the sun; current belief
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13
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the condition of very low gravity
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14
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refers to the moon
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17
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a concentration of matter found in space that is the beginning of a star
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18
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the path a planet, moon, or other object takes around another
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19
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the science that studies the origin, features, and motion of objects in space
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22
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an imaginary line on which an object rotates
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25
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bits of rock and dust debris left behind by comets
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27
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the sun and all the planets and other objects that orbit it
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28
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meteors that have plunged to Earth's surface
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29
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the layer of gases surrounding Earth or another planet
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30
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all the matter and energy that exist
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