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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 would appear if 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 though its 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 yhe Northern Hemisphere, can be seen 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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H-R 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 dsitribution 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 consisting of a small, extremely 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 brighter
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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 star
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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 movig 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 tremendous amount of radiation energy in the form of light and heat
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Supergiant
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Extremely 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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