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19 Cards in this Set
- Front
- Back
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Absolute Magnitude
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a measure of the light actually given off by a star or celestial object
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Apparent Magnitude
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the measure of the light that reaches Eath from a star or celestial object
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Big Bang Theory
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the theory for the formation fo the universe which posits that the universe formed as it expanded out of a massive explosionn over 15 billion years ago
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binary system
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system in which two stars orbit each other
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black hole
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final remnant of some massive stars
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chromosphere
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middle layer of the sun's atmosphere located between the corona and photosphere
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constellation
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a star grouping usually named after a mythological character, animal or other common object it resembles
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corona
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largest outermost atmospheric layer of the sun
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galaxy
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massive celestial grouping of gas, stars, and dust bound together by gravity...usually elliptical spiral or irregular in shape
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giant
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late stage in life cycle of a star when hydrogen in the star's core grows hotter and contracts, forcing the expansion of the star's outer layers
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light year
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unit of measurement based on the distance light can travel in a single year
aprx 9.5 killion km |
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main sequence
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diagonal band found on the Hertzsprung Russell diagram that incudes 90 percent of all known starts...demonstrates relationship between color bightness and temperature of a star
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nebula
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large dust and gas cloud found in space that could be the beginnings of a star
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neutron star
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last stage in a star's life cycle when a supernova's core collapses to about 10-15 km and becomes so dense that only neutrons are able to exist inside
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parallax
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an object's appareent shift in position when looked at from two different points
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photoshpere
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the sun's inner atmospheric layer which radiates the sun's visible light
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sunspot
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dark area on the surface of the sun visible because it's cooler than the surrounding areas...caused by strong magnetic field of the sun
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super giant
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late staage in a star's life cycle when the termperature of a star's core increased dramatically, heavy elements are formed by fusion and the outer layers of the stars expand
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white dwarf
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late stage in a star's life when the heliumfuel core of a star is exhausted ant the unstable outer layers of the star travel out into space leaving only a white-hot, dense core behind
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