just adding to the response...
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what does this have to do with the Big bang? Our solar system wasn't created from the Big Bang but much later... Most likely from a Super Nova blast.
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Do you? an object as big or bigger then the planet/moon can do this. But I would bet your head alone can do it.
If a moon formed at the same time/location as the planet, then you would expect it to orbit & spin in the same direction, unless it was later smacked the other way by a huge collision (which seems to be common). But captured asteroids (again, common) can go whichever way.
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a dent?
Take a look at photos of those moons. Craters abound.