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Chapter 8 Section 2

Vocabulary Chapter 8 Section 2

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
Created by: bekah0515