#8 What is a blackbody? In what way is a blackbody black? If a blackbody is black, how can it emit light? If you were to shine a flashlight beam on a perfect blackbody, what would happen to the light? #10 Explain why astronomers are interested in blackbody radiation #20 What is the Doppler effect? Why is it important to astronomers? #21If you see a blue star, what does its color tell you about how the star is moving through space?