We've seen them
portrayed in a vast variety of Hollywood films, from the nasty, slimy suckers
shown in Independence Day to the precious, teddy-bear-esque creature that
charmed us in E.T. But which is closer to the truth? As our understanding of
the universe grows and the outlook on our existence is in turn humbled,
scientists are beginning to theorize what these extraterrestrials might look
like.
