Silly tangent, but imagine how insulting it would be to see undeniably alien activity around the moons of Jupiter or Saturn? A swarm of alien craft loading materials from a moon for weeks on end, completely ignoring Earth... I can't really think of anything more insulting, except perhaps adding an Earth flyby on their way out of the solar system.
Solfe
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'That was tops! Who's not good at math? I was all, "Four!"' - Finn, Adventure Time.