Question: what are the 4 main types of stars?
Answer: Blue Stars. These types of stars are quite rare with spectral types of either O or B. ... 
Yellow Dwarfs. Yellow dwarfs have a 10% prevalence, with a spectral type G. ... 
Orange Dwarfs. ... 
Red Dwarfs. ... 
Blue Giants. ... 
Blue Supergiants. ... 
Red Giants. ... 
Red Supergiants.