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.
As we said last time, the spectral sequence O, B, A, F, G, K, M is a temperature sequence, with the hottest stars being of type O (surface temperatures 30,000-40,000 K), and the coolest stars being of type M (surface temperatures around 3,000 K).