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Reeves Test 25

Earth Science vocabulary for chapter 25

TermDefinition
constellation an apparent group of stars originally named for mythical characters; presently 88
binary star one of two stars revolving around a common center of mass under their mutual gravitational attraction
light year the distance light travels in a year; about 9.5 trillion kilometers
apparent magnitude the brightness of a star when viewed from Earth
absolute magnitude the apparent brightness of a star if it were viewed from a distance of 32.6 light years
main sequence star a star that falls into the main sequence category on the H-R diagram
Hertzsprung-Russell diagram a plot of stars according to their absolute magnitudes and temperatures
galaxy a group of stars, dust, and gases held together by gravity
Big Bang Theory the theory that proposes that the universe originated as a single mass, which subsequently exploded
Hubble's Law a law that states that the galaxies are retreating from the Milky Way at a speed that is proportional to their distance
Created by: Suzi Atwood
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