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study guide-chapter 13

STUDY
PLAY
Name the four types of galaxies.
spiral, barred spiral, elliptical, and irregular
Name the star colors.
blue, white, yellow, orange, and red
Which color of stars are the hottest?
blue
Which color of stars are the coolest?
red
What causes the seasons?
How the earth is tipped on it's axis.
What is a light year?
Measures how far light travels in a year.
Where does a star's energy come from?
Nuclear Fusion