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12 Cards in this Set
- Front
- Back
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spinning of Earth on its axis, which occurs once every 24 hours, produces day and night, and causes the planets and stars to appear to rise and set
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Rotation
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regular, curved path followed by Earth as it moves around the Sun
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orbit
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movement of Earth around the Sun, which takes a year to complete
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revolution
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event that occurs when the Moon moves between the Sun and Earth (solar eclipse), or when Earth moves between the Sun and the Moon (lunar eclipse, and casts a shadow
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eclipse
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system of nine planets and numerous other objects that orbit the Sun, all held in place by the Sun’s gravity
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solar system
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unit of measure that equals 150 million km, which is the mean (average) distance from Earth to the Sun
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astronomical unit
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large body of frozen ice and rock that travels toward the center of the solar system and develops a bright, glowing tail as it approaches the Sun
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comet
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any space fragment that survives its plunge through the atmosphere and lands on Earth’s surface
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meteorite
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group of stars that forms a pattern in the sky and can be named after a real or imaginary animal, object, or person
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constellation
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very bright explosion of the outer part of a supergiant that takes place after its core collapses
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supernova
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group of stars, gas, and dust held together by gravity
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galaxy
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about 9.5 trillion km – the distance that light travels in one year – which is used to measure large distances between stars or galaxies
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light year
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