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1. Luminosity is another word for the vocabulary word _________. 2. If two stars are different colors, we can infer that they have different a. chemical compositions c. shapes b. masses d. temperature 3. Which magnitude is brightest? a. -2 c. 4 b. -4 4. The dimmest class of star is the a. O c. K b. B d. M 5. The hottest stars in space are _____ color. a. yellow b. red c. blue d. white 6. The coolest stars in space are _____ color. a. yellow b. red c. blue d. white 7. A sequence of star colors from hottest to coolest is _____. a. blue, yellow, orange, red b. blue, red, yellow, orange c. red, orange, yellow, blue d. yellow, blue, orange, red 8. What vocabulary word describes the brightness of stars? _______________ 9.What is the temperature of Sirius B? 10. Luminosity of Sirius B?