The classes all count the same. You can take the classes for your AA in the first 2 years and complete all your prereqs. then transfer for your BSN and it will be take you the two years. You still can follow the same path as the 4 year college. Either way you still have to take the prereq. classes.
Blue stars are the hottest whilst black dwarfs are the coldest. (However, no black dwarfs exist yet - see related question) The stellar classification [See link] in order of temperature. Our Sun is classed as yellow.
Basically its just a big fire ball. Actually alot of the stars we see are a blue color; therefore meaning they are hotter than our sun itself. Our sun is a yellow star: cooler than blue, and hoter than red. But we do also have red and yellow stars.