The main colour of space is black. Obviously, as its really dark out there. however, there are stars, the sun, and other bright objects that provide light. Otherwise, it would be seriously dark and...
Blue Then white than yellow than red. The coolest live the longest though. The hottest are bigger that the cooler ones. When the blue ones die they turn into black holes. The white ones turn into...
Black, if looking away from planet earth.... but then that is not the sky, that is looking at "space" itself. Whe looking at the earth, the "sky" (as ground-walkers see it) is not visible to folks up...