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C h 30

the universe

QuestionAnswer
star a large celestial body that is composed of gas and emits light
circumpolar stars stars that are always visible in the night sky as they revolve around Polaris
Doppler effect an observed change in the frequency of a wave when the source or observer is moving
red shift a spectrum shifted slightly to the red (longer)end; signifies object moving away
blue shift a spectrum shifted slightly to the blue (shorter)end; signifies objects moving toward
light-year the distance light travels in one year: about 9.46 trillion km
parallax an apparent shift in position of an object when viewed from different locations
apparent magnitude the brightness of a star as seen from Earth
absolute magnitude the brightness that a star would have at a distance of 32.6 light-years from Earth
H-R diagram Hertzsprung-Russel diagram which plots stars' temperature and magnitude
main sequence stars "stable" stars that lie on the H-R diagonal from bottom right to top left; our Sun is one of these
nebula a large cloud of gas and dust in interstellar space; where stars are formed
protostars central concentration of matter formed as the nebula spins and condenses
red giant large, bright star that has fused most of its Hydrogen; has a lower temperature
white dwarf dim, hot star that is the leftover center of an old star
nova a star that suddenly becomes brighter
Created by: sisteele
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