We’ve not seen any aliens yet, and there is no reason why they should be green. We’re not even sure why plants are green for instance, they shouldn’t be, they should be black to work at their most efficient. So – aliens will probably be any colour that suits them!
Aliens could look like anything! They’d probably have really strangely shaped bodies to cope with a different strength in gravity, and would have evolved weird and wonderful body parts that would help them out on their home planet.
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