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chapter 21vocab

QuestionAnswer
how bright a star appears to an observer on earth apparent magnitude
the average distance between earth and the sun, about 159 million km Astronomical unit
theory that the unuverse was originally a single dense sphere od hydrogen that exploded into gigantic expanding cloud that eventually condensed into seperate galixies Big Band hypothesis
massive objects in space whos gravitational forces are so strong that light rays cannot escape black holes
a group of stars that appears to form a pattern in the sky constellation
a group of million, oor even billions of stars held together by gravity galaxy
the distance a ray of light travels in one year, about 9.5 trillion km. light-year
the actual, or true brightness of a star luminosity
a large cloud of gas and dust in space nebula
the dense core that remains after a large star explodes neuton star
a star that has flared into intense brightness nova
an intensely bright object caused by the explosion of a massive red giant star supernova
Created by: walkerabigailt
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