All of you may have heard this. Without the Moon, Earth's axis would fly wildly out of control due to the other planets' gravity. Now, that makes sense, the Moon giving a stabilizing effect. But what confuses me is why Venus and Mercury both have near 0 degrees of tilt. They don't have a moon to stabilize them, so why are their axis' not flailing out of control? Is it something to do with Earth's distance from Jupiter and the Sun? I'd like to hear your ideas on this. Thanks.