Stellar Spectra

The pictures below show 3 very different types of star.

pics NASA

1. Which star

a) is the hottest?        b) is the coolest?        c) is most like our Sun?        d) is probably the smallest?      e) would be a type G star?

2. What letters are used to denote the 7 spectral classes of star?

3. On the axes below shade in regions to represent

a) The main sequence  b) giants and supergiants   c) white dwarfs

4. Are type B stars big or small?