Archetypes and the planets

The question that remains is that if Saturn is the archetype father planet for the ego, what would be the archetype planet for the mother archetype? (Of course, all this stuff came out/over/through the dream I had the other night, and I really don't know anything about planets and archetypes and all this, so *please*, if you come along on this blog and you can contribute something to the gestation bin, please do!)
I thought maybe the mother archetype planet would the Sun, you know, the Sun gives life, makes things grow, makes warmth, etc. but then I thought maybe it would be the Moon, with it's feminine connections...