A common theme in science fiction is
that aliens want earth for some reason. That premise is really
flimsy, though, when considering that there's nothing on earth that
can't be found on countless other planets. What minerals do we have
that can't be dug up somewhere else in the universe? Maybe it's
water—the aliens are here to steal our water! No, water is
plentiful on other worlds, and there is probably more water on some
of Jupiter's moons than we have here! Why would aliens travel
hundreds of trillions of miles through space to take from us what
they can probably already find in their own neighborhood? Not to
mention, how are they going to make such a long trip worth it, unless
they manage to haul back enormous amounts of whatever it is they're
seeking? Transport alone would be quite a massive undertaking. It's
comical, really, to suggest that aliens have any need of what we have
on Earth, but it's no surprise that we would imagine such things—we
love our planet, and in the scope of human existence, it wasn't
really that long ago that we even thought the sun revolved around us!
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