Quote:
Originally Posted by weswood
Mission: Subjugate mankind and exploit the Earth's resources, primarily precious and regular metals (iron, tin, copper etc.).
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If you are a species capable of crossing interstellar space why would you come all the way to another solar system and down into a gravity well to exploit mineral resources? The asteroid belt (and more than likely asteroid belts in many if not most solar systems) contain vast amounts of all kinds of minerals. If you are a major space faring people that's where you'd get the bulk of your resources, not from the surfaces of major planetary bodies.
You need to come up with something the aliens want that they can only get here. Maybe humans themselves are the resource the aliens want?