Deneb and Betelgeuse are both 20x the mass of the Sun, but look very
different. Deneb has 100 times the radius of the Sun and its temperature is
about 8000 K. Betelgeuse has 1000 times the radius of the Sun and its
temperature is about 3500 K.
1.What stages of their lives are the two stars in?
2. How long does each star have to live?
