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Now that is an epic screen shot.
If I'm not mistaken, Earth is gone. That was the Nomads first encounter with humanity, when, just after the coalition captured Earth, a Nomad planet (System?) destroyer came, and decided they would blow everything away. At least, that is what I heard.
Yeah, its supposed to be a secret but there are a few riddles you can find. If you find the right nebula (by solving the riddle) try using the lightning to find what your looking for.
Forgot to mention to look for the riddle on discoveryGC.com