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Chapter 8 Section 2
Vocabulary Chapter 8 Section 2
Vocabulary | Definition |
---|---|
galaxy | a giant structure that contains dust, gases, and hundreds of billions of stars |
universe | all of space and everything in it |
light - year | the distance that light travels in one year |
parallax | the apparent change in position of an object when seen from different places |
giant star | a very large star, much larger than the sun |
apparent magnitude | the brightness of a star as seen from Earth |
absolute magnitude | the brightness of a star if it were a standard distance from Earth |
Hertzsprung-Russell diagram | a graph relating the temperature and brightness of stars |
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 |