I beleve that yes, there is life in the Solar System.
You just can't deny the links on moons that have alot of water and other componds such as Oxygen, Nitrogen, Hydrogen and Carbon (the atoms that need to be there for life to form) have been found on the moons of the Gas Planets, must have some form of life, it could be a simple one cell life form to a life form like us.
I dont think that any aliens will come here to take over the Earth, why, if they can travel those long distences, then they must know how to make water fuel etc...
This thread is a bit dumb, so my last post here.