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15 Cards in this Set
- Front
- Back
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Galaxy
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a large system of stars held together by mutual gravitation and isolated from similar systems by fast regions of space
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milky way
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the spirel galaxy containing our solar system
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spirel galaxy
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a galaxy having a spirel structure; arms containing younger stars spirel out from old stars at the center
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elliptical galaxy
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a type of galaxy having the shape of a spheroid or ellipsoid rather than a disk
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iregular galaxy
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a galaxy that does nto have a clearly defined shape or structure
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local group
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a group of 17 galaxies that includes our own, the milky way galaxy
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binary stars
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a stellar system consisting of two stars orbiting about a sommen center of mass and often appearing as a single visual or telescopic object
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cluster stars
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groups of stars witch are gravitationally bound. there are two kinds-spherical(round) and open (loosely arranged)
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big bang
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a theory of the birth of the universe from a single cosmic explosion. it holds that the universe is still expanding
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revolution
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the orbit of the earth around teh sun witch determines teh length of a year (365 1/4)
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rotation
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the spinning of teh earth on its axis witch determines the length of a day(24 hours)
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astroid
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a rocky and metallic object that orbits the sun but is to small to be considered a planet. known as a minor planet
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comet
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a relativley small extraterrestial body consisting of a frozen mass(water and gases) that travels around the sun in a highly Elliptical orbit
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solar eclipse
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this occurs when the moon passes in front of the sun and either partially or totally blocks it from our view
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luner eclipse
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this occurs when the earth passes between the sun and the moon , the moon passes through the earth's shadow
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