Lots of aliens will be hitting the streets this Halloween. There'll be big-headed, beady-eyed grays ... pointy-eared Starfleet officers ... reptiles with mouths that bristle with fangs ... fur-faced wookiees and more.
But you hardly ever see depictions of extraterrestrials that live underwater — and there's a good reason for that, says Don Lincoln, author of a new book titled "Alien Universe: Extraterrestrial Life in Our Minds and in the Cosmos."
The reason? It's hard to build a fire underwater.
Some experts speculate that many of the habitable planets in our galaxy are water worlds, with no land in sight. But those wouldn't the best places for technologically advanced civilizations to take root.
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