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Chapter 15 vocab
Science
9
Science
8th Grade
05/21/2009

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Term
Spectrum
Definition
the band of colors produced when white light passes through a prism
Term
Apperent Magnitude
Definition
the brightness of a star seen from the earth
Term
Absolute Magnitude
Definition
the brightness that a star would have at a distance of 32.6 light-years from earth
Term
light-year
Definition
the distance the light travels in one year; about 9.46 trillion kilometers
Term
parallax
Definition
an apperent shift in the position of an object when viewed from the different locations
Term
main sequence
Definition
the location on the H-R diagram where most stars lie; it has a diagonal pattern from the lower right (low temperature and luminosity) to the upper left (high temperature and lumionosity)
Term
H-R diagram
Definition
Hertzsprung-Russel diagram; a graph that shows the relationship between a star's surface temperature and absolute magnitude
Term
supernova
Definition
a gigantic explosion in which a massive star collapses and throws its outer layers in space.
Term
galaxy
Definition
a collection of star, dust, and gas bound together by gravity
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