Discuss each question with your team. Be prepared to explain the reasoning behind your team's answers after the quiz.

  1. Which star is hottest?
    • An F8 horizontal branch giant
    • An F3 main sequence star
    • A K2 supergiant
    • A G5 main sequence star
  2. There are two G2 V stars. One is 9 times as bright as the other. What’s the distance to the dimmer star with respect to the brighter star?
    • 3 times closer
    • 9 times closer
    • 3 times further away
    • 9 times further away
  3. What does a color index of B-V = -0.11 mean for a star?
    • The star is more blue than red, so it is a hot star
    • The star is more blue than red, so it is a cool star
    • The star is more red than blue, so it is a hot star
    • The star is more red than blue, so it is a cool star
  4. When a main sequence star becomes a red giant, it _________
    • increases in temperature and luminosity.
    • decreases in temperature and luminosity.
    • increases in temperature and decreases in luminosity.
    • decreases in temperature and increases in luminosity.
H-R diagram