To me, it's the ocean. Sure space is scary too, since there's no sound nor oxygen. But it sure as hell is fascinating. The ocean is on a whole different level. We've explored less than 5% of the depths and we don't know what could be down there.
Discuss.
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Edited by Dr_Sorethumb: 4/3/2016 7:05:14 AMSpace. Although it's some way off, I would imagine what we could find out there would make the weirdest of ocean creatures look mundane.