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30 Cards in this Set
- Front
- Back
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Absolute Magnitude
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Brightness of a star as it is located 32.6 light years from the earth.
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Apparent Magnitude
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Brightness of a star as it appears from the earth.
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Barred spiral galaxy
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Type of spiral galaxy with a bar of stars that runs through it's center.
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Binary Star
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Pair of stars that revolve around each other.
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Black Hole
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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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Circumpolar
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describing any star that is always visible in the night sky and, from the Northern Hemisphere, can be circling Polaris.
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Constellation
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Pattern of stars.
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Elliptical Galaxy
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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.
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Galaxy
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large-scale group of stars.
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Giant
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Very large, cool, bright star.
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Globular Cluster
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spherically shaped group of hundreds of stars located around the core of the milky-way galaxy.
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HR-diagram
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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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Irregular Galaxy
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type of galaxy with no identifiable shape and an uneven distribution of stars within it.
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Light-year
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distance that light travels in one year, about 9.5 trillion km.
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Main sequence star
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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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Nebula
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Dark cloud of gas and dust in space; first stage in the development of a star.
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Neutron star
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collapsed core of a supernova consiting of a small, extremly dense ball of neutrons.
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Nova
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White dwarf star that explodes as it cools, temporarily becoming thousands of times bigger.
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Open cluster
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loosely shaped group of hundreds of stars.
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Parallax
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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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Planetary nebula
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Expanding shell of gases shed by a dying star.
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Protostar
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center of a shrinking, spinning nebula; the second stage in the development of a nebula.
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Pulsar
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Neutron star that emits two beams of radiation that sweep across space.
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Quasar
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starlike object that gives off radio waves and X rays.
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Red Shift
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apparent lengthening of the light waves emitted by a star moving away from the earth.
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Spiral Galaxy
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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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Star
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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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Supergiant
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extremly large, giant star.
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Supernova
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star that blows apart with a tremendous explosion.
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White dwarf
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small, hot, dim star.
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