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30 Cards in this Set
- Front
- Back
brightness of a star as it would appear if located 32.6 light-years from the Earth (553)
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absolute magnitude
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brightness of a star as it appears from the Earth (552)
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apparent magnitude
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type of spiral galaxy with a bar of stars that runs through its center (563)
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barred spiral galaxy
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pair of stars that revolve around each other (564)
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binary star
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hole in space with a gravity so great that not even light can escape, formed by the collapse of a very large supernova
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black hole
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describing any star that is always visible in the night sky and, from the Northern Hemisphere, can be seen circling Polaris
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circumpolar
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pattern of stars
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constellation
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type of galaxy with a very bright center that contains little dust and gas and is spherical to disklike in shape (563)
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elliptical galaxy
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large-scale group of stars
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galaxy
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very large, cool, bright star
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giant
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spherically shaped group of hundreds of stars located around the core of the Milky Way Galaxy
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globular cluster
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Hertzsprung-Russell diagram; graph showing the relationship of the surface temperature and absolute magnitude of a star
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H-R diagram
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type of galaxy with no identifiable shape and an uneven distribution of stars within it
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irregular galaxy
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distance that light travels in one year, about 9.5 trillion km
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light-year
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star with characteristics that place it within a band running through the middle of the H-R diagram
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main-sequence star
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dark cloud of gas and dust in space; first stage in the development of a star
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nebula
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collapsed core of a supernova consisting of a small, extremely dense ball of neutrons
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neutron star
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white dwarf star that explodes as it cools, temporarily becoming thousands of times brighter
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nova
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loosely shaped group of hundreds of stars
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open cluster
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method of determining the distance from the Earth to a star based on the shift in the apparent position of the star when viewed from different angles
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parallax
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expanding shell of gases shed by a dying star
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planetary nebula
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inside a nebula, the shrinking, spinning center region; the second stage in the development of a star
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protostar
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neutron star that emits two beams of radiation that sweep across space
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pulsar
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starlike object that gives off radio waves and X rays
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quasar
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apparent lengthening of the light waves emitted by a star moving away from the Earth
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red shift
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type of galaxy with a nucleus of bright stars and flattened arms that swirl around the nucleus
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spiral galaxy
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body of gases that gives off a tremendous amount of radiant energy in the form of light and heat
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star
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extremely large, giant star
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supergiant
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star that blows apart with a tremendous explosion
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supernova
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small, hot, dim star
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white dwarf
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