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Vocabulary Chapter 8 Section 2

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Vocabulary
Definition
galaxy   a giant structure that contains dust, gases, and hundreds of billions of stars  
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universe   all of space and everything in it  
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light - year   the distance that light travels in one year  
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parallax   the apparent change in position of an object when seen from different places  
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giant star   a very large star, much larger than the sun  
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apparent magnitude   the brightness of a star as seen from Earth  
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absolute magnitude   the brightness of a star if it were a standard distance from Earth  
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Hertzsprung-Russell diagram   a graph relating the temperature and brightness of stars  
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main sequence   an area on the Hertzsprung-Russell diagram that runs from the upper left to the lower right and includes more than 90% of all stars  
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Created by: bekah0515
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