1 colony = 1 resource produced
1 ship = 1 resource produced
1 factory = 2 resources produced.
So if you have 1 ship and 1 colony on a planet, you get two resources.
If you have 1 ship and 1 factory, you produce 3 resources.
Yes, that's what I said. The way we were playing, it was difficult to imagine a resource monopoly strategy (which, trust me, I was gunning for... I ended up losing by about 7-8 points. Now that I think about that, with that handicap, that's not that bad )