Well, there's always Manga Khan's "Shop or Die" arc from Keith Giffen's Justice League International. "Shop or die, earthlings! Offer void where prohibited."
A few weeks ago I saw this National Geographic special called When Aliens Attack which shows how an actual alien invasion would occur according to experts.
During the program they dispelled the common reasons for invasion (like water since it's so plentiful in the universe) and the one reason they came up with is that aliens would only be interested in stripping Earth of two things scientists here haven't found outside of our world: protein and chlorophyl.
And as the show went on they further speculated that the aliens instead had sent an automated invasion force that was converted all the bio matter into a type of fuel for them. It was a pretty interesting show overall.
Is there such a thing as strategic location in space?
Yes, for all the same reasons forts out on the old frontier were important to the United States government at the time. A faster speed doesn't eliminate the need for supply depots, it just moves them further down the road.
Earth might also be in the perfect spot to plant a fortified observation post to spy on the neighboring interstellar empire. Especially since the neighbor's last survey showed a bunch of meat-based lifeforms. (Who wants to meet meat?)
I mean, c'mon guys, its like you don't even watch science fiction!![]()
The requisite technology needed to traverse interstellar space is so insanely complex that anyone that masters it would have absolutely no interest in Earth. Period. Terraforming is nothing. Growing organs is nothing. Anything that a civilization does that can't do either of those two things is not militarily threatening.
I'd have to say Xenophobia. At one time in their past the aliens may have been attacked or exploited by another race, and it's remained a part of their psyche. Now when they come across a technologically developing civilization, they stamp it out in fear.
And while doing so, exploit the resources of the planet. Thus they have become what they fear.
What if we Earthlings had some kind of Draka-style dystopia going on, and we discovered FTL? Such a society might actively seek to conquer and enslave an alien race, regardless of the economic irrationality of spending resources that way, just because that's what that society does.
Maybe they're just assholes.
What if we Earthlings had some kind of Draka-style dystopia going on, and we discovered FTL? Such a society might actively seek to conquer and enslave an alien race, regardless of the economic irrationality of spending resources that way, just because that's what that society does.
Or the aliens could seek to conquer and enslave us for the exact same reason: it's just what THEY do.![]()
If anything (assuming there are parallel universes and it's technologically feasible to travel between them a la Fringe, Sliders, Charlie Jade, and Trek's own Mirror Universe) there would be a far greater likelihood of an invasion from an "evil" imperialistic, ultra-Stalinist/fascist, super-capitalist, Earth than an alien race capable of FTL.
If an alien species wanted to conquer us for the sake of conquering us, it probably would have already happened
I think by far the best and least used motivation(in science fiction) for an alien invasion would be religious in nature. Something along the lines of our fictional aliens feeling that all sentient beings in the universe must acknowledge their deities.
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