The diagram below compares the brightness and surface temperature of stars.
lo
oglue glants
blue giantsuperglants
10,000 suns
o
main sequence
100 suns +
> red giants
luminosity (brightness)
relative to sun
1 sun
sun

sun
too
ooo
ooº
0.01 sun
white dwarfs
3,500
25,000 11,000 7,500 6,000 5,000
surface temperature (k)
compared to most red giants, the sun is -
a brighter and hotter
b brighter and cooler
cless bright and hotter
d less bright and cooler