LESSON 1 2. List the four most common star colors (red, white, blue, and yellow) in order from coolest to hottest. (Coolest) Blue White Yellow Red (Hottest) 3. Stars of each of the four colors from question 2 are of which spectral type (OBAFGKM) in order from coolest to hottest? 4. Match the properties of a star on the left with where it will be found on the H-R Diagram. Put a to d into the blank space: 1. Hot (), 2. Cool ( ), 3. Bright ( ), 4. Dim ( ) I