Paradise.

That's all Princess Luna wanted. A world where everypony would live nocturnally, basking in her glory versus Celestia's. It was a simple wish, but sometimes even the most small of things can make a big difference. Now banished from her home for one thousand years, Luna must make the most out of her new living area, which happens to be the moon. And, to Luna's dismay, there's not much to do on the moon. It wouldn't hurt to explore the cosmos a bit... right?

[The return of Nightmare Moon was altered, so I put under Alternate Universe as well]