Because of the leaked concept arts of Destiny, the "moon" isn't really the moon, it's an alien space ship. But if you compare that image to any other image before the leaks, it's a septagon. Look closely to those advertisement or even the news update.
Are we the Aliens? Are we invading our own planets?
[Edited on 11.28.2012 8:10 AM PST]
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The concepts really make me excited, sadly though the orb alien ship speculant made me think of a giant didact cryptum. I need something concrete to stop me from thinking of it in such a horrific manner. Bungie has my gameplay guarentee but ugh. time to light a match. it will burn out since it's just a match, but don't make me compare concept art to current games.