Hmm, I might have given away too much with that sentence. :)
Oh yes, a key . . .
Black - Explored Space (inasmuch as space can be explored in SWN)
Purple - 'Hunch' Space (big bags of guesses from old charts, here-say, and psychic divination)
Dark Blue - The righteous Aquila Union
Orange - The Ptolemy Wilds, controlled by the Alliance of Independent Systems
Red - The foul fungal Skorpios Empire
White - The El Dorado Archipelago, a sort of close cluster in the El Dorado Sector
Yellow - A horrible, horrible place filled with genocidal machines and dog-bear things with horns.
Light Blue - The New Mandate, a place quite unknown to the PCs, that sounds pretty well organized.
Okay, that's about it.
- Ark :)