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30 Cards in this Set
- Front
- Back
Define spectrum
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the band of color produced when light passes through a prism
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Define apparent magnitude
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the brightness of a star as seen from Earth
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Define absolute magnitude
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The brightness that a star would have at a distance of 32.6 light-years from Earth
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Define light-year
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the distance that light travels in one year; about 9.5 trillion years
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Define parallax
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an apparent shift in the position of an object when viewed from different locations
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Define red giant
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a large reddish star late in its life cycle
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Define white dwarf
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a small, hot, dim star that is the leftover center of an old star
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Define H-R diagram
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Hertzsprung-Russell diagram, a graph that shows the relationship between a star's surface temperature and absolute magnitude
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Define main sequence
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the location on the H-R diagram where most stars lie
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Define supernova
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a gigantic explosion in which a massive star collapses and throws its outer layers into space
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Define spectrum
|
the band of color produced when light passes through a prism
|
|
Define apparent magnitude
|
the brightness of a star as seen from Earth
|
|
Define absolute magnitude
|
The brightness that a star would have at a distance of 32.6 light-years from Earth
|
|
Define light-year
|
the distance that light travels in one year; about 9.5 trillion years
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|
Define parallax
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an apparent shift in the position of an object when viewed from different locations
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|
Define red giant
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a large reddish star late in its life cycle
|
|
Define white dwarf
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a small, hot, dim star that is the leftover center of an old star
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Define H-R diagram
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Hertzsprung-Russell diagram, a graph that shows the relationship between a star's surface temperature and absolute magnitude
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Define main sequence
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the location on the H-R diagram where most stars lie
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Define supernova
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a gigantic explosion in which a massive star collapses and throws its outer layers into space
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Define neutron star
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a star that has collapsed under gravity to the point that the electrons and theprotons have smashed together to form neutrons.
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Define pulsar
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a rapidly spinning neutron star that emits rapid pulses of radio and optical energy
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Define black hole
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an object so massive and dense that even light cannot escape its gravity
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Define galaxy
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a collection of stars, dust and gas bound together by gravity
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Define nebula
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a large cloud of dust and gas in interstallar space; a region in space where stars are born or where stars explode at the end of their lives.
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Define globular cluster
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a tight group of stars that looks like a ball and contains up to 1 million stars
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Define open cluster
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a group of stars that are close together relative to surrounding stars
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Define quasar
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a very luminous, starlike object that generates energy at a high rate; quasars are thought to be the most distant objects in the universe
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Define cosmology
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the study of the origin, properties, processes and evolution of the universe
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Define the Big Bang Theory
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the theory that states the universe began with a tremendous explosion 13.7 billion years ago
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