Free Energy From Gravity?

Anyone who understands the principles of conservation of energy knows that free energy is impossible. You can never take more energy out of a system than is put into it, or it will eventually stop working. All of that suddenly comes into question when you consider the acceleration of bodies traveling near a large mass such as a planet. Imagine a large asteroid orbiting in the asteroid belt between Mars and Jupiter. A relatively tiny amount of force applied to the asteroid at just the right time can send it out of the belt toward Jupiter. If the asteroid passes close to Jupiter without crashing into it, the asteroid will be accelerated to incredible speeds and gain huge amounts of kinetic energy, enough to escape the gravitational pull of the planet. The amount of energy produced can equal thousands or millions of megatons of explosive force, enough to wipe out all life on Earth. Where did that energy come from? We assume that the energy is a result of gravitational forces. But if the laws governing the conservation of energy are correct, then all that energy put into the asteroid must be removed from the planet in some way. We could observe that the pull of the asteroid causes the orbit of Jupiter to become slightly altered, thus indicating the planet lost some of its kinetic energy in the process of transferring it to the asteroid. But if we next send a comet with the same mass and velocity of the asteroid in from the Kuiper belt, at exactly the opposite angle, the orbit of Jupiter would return to what it was to start with. We would now have two vastly accelerated bodies, twice as much available energy, with absolutely no change to the planet. It appears that this process can be repeated indefinitely. Although totally impractical, it is hypothetically possible to replace the accelerating bodies with massive magnets and have them pass though huge copper coils orbiting the planet and create enough electrical energy to power everything on Earth forever. But where does that energy come from? One of two explanations might be possible. Either the planet loses some of it's gravitational pull, which seems unlikely because gravity is a direct result of mass and the mass of the planet has not been altered. The other possible explanation is that the moving bodies gained energy without taking energy away from the planet, which is a direct contradiction of the principles of conservation of energy. Unless this contradiction can be resolved, we can not conclude that free energy is impossible.

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