To dream of the entire galaxy represents feelings of being unable to do anything about something you don’t fully understand. A situation or problem may be too big to understand. Being exposed to sophistication or intelligence that astounds you.
To dream of a dark or strong blue colored represents may represent feelings about how unfair it is to be experiencing something too big to understand or control.
To dream of a light blue represents a very positive situation that you can’t understand or control at all. Experiencing a highly positive or abundant situation that astounds you. You can’t figure out how it’s possible that something is as good or incredible as it is.