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Originally posted by drmuldor
Here's my theory:
In the next millenia, oxygen levels in our atmosphere will drop due to pollution or some other reason, there might be less sunlight (maybe even when our sun has turned into a white dwarf) and the human race has somehow survived this event (moving to Mars/Titan/...). There is less oxygen, so creatures will be generally smaller. Or maybe they live on a smaller planet (a recent study discovered that dinosaurs that were living on small islands were notably smaller than their family members on large continents). The lack of sunlight will turn the skin color more grayish, paler like grays are. Evolution will make our joints smaller and more robust... add this together and which creature you get? Exactly, a gray.
Maybe they discovered a way to travel back in time and they want to use us as a DNA stock, research, anything. Hell maybe the Roswell researchers were shocked to find the letters U.S.A.F. on the hull of the wreckage
Originally posted by drmuldor
(maybe even when our sun has turned into a white dwarf)