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10 Cards in this Set
- Front
- Back
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scientific notation
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the system of recording very large or very small numbers by using powers of 10
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solar system
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the sun and its planets, asteroids, comets, and so on
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planet
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a small, nonluminous body formed by accretion in a disk around a protostar
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star
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a globe of gas held together by its own gravity and supported by the internal pressure of its hot gases, which generate energy by nuclear fusion
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astronomical unit (AU)
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average distance from earth to the sun
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light-year (ly)
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a unit of distance. the distance light travels in 1 year
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galaxy
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a large sustem of stars, star clusters, gas, dust, and nebulae orbiting a common center of mass
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Milky Way
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the hazy band of light that circles our sky. produced by the glow of our galaxy
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Milky Way Galaxy
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the spiral galaxy containing our sun. visible in the night sky as the milky way
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spiral arm
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long spiral pattern of bright stars, star clusters, gas, and dust. spiral arms extend from the center to the edge of the disk or spiral galaxies
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