Good, and Evil. Chaos and Law. and of course Neutral. Each of these alignments has its own aspects.
Aspects first appeared decades after each realm had finally settled. As an alignment guides each outer realm so too was the creation of their own Aspects. Instead of forming from any physical or innately magical origin, the aspects are from the concepts and ideas found in each alignment. While not every Aspect is known as time goes on more and more people will discover and document these odd phenomena.