List the stars below from coolest to hottest.

Sirius

Betelgeuse

Rigel

Sun

Arcturus

The different colors of the stars indicate their temperature: the hottest stars tend to appear blue while the coolest stars are red. Based on their colors and temperatures, the given stars can be listed from coolest to hottest as:

Betelgeuse - reddish in color with around 3500K surface temperature

Arcturus - reddish or orange with around 4290K surface temperature

Sun - yellow with around 5800K surface temperature

Sirius - white to blue-white with surface temperature around 9940K

Rigel - blue-white with surface temperature around 12500K