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9000 years was a guess. We all assume that the moon has no life on it, but planets like Mars possibly do, however, we are still devolping technology to go to mars, so the Aliens will probably be developing technology to go to Jupiter or something, they might not go to earth first.
I just had the most fantastic Idea for a film then I realised it's exactly the same as Oddworld 
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Jupiter isn't solid... you can't "Go" to it. It's made of gas. It does have some solid moons though... one of those actually might have an ocean, which presents the possibility of life existing there. Although that goes by the common assumption of all those "life elsewhere" fantatics, that life just magically occurs everywhere, like it just appears out of thin air or comes up out of the ground.
The age old "but the universe is so big!" argument holds about as much water as a leaky bucket. Considering that the chances for life to be created is one in dectillions, which is the highest named numeral without using "to the power of". I've said this so many times to so many people, but it never seems to get through. Logic and reason don't factor into something if a person wants to believe in it.