Celestis is the homeworld of the Alterans, and by extension, the Ancients, the Ori, and the rest of Humanity. It's also the location of Ver Eger, a village populated by humans who worshiped the Ori. The Plains of Celestis is where the City of Celestis is located, which is the home of the Doci and the Flames of Enlightenment, where the Ori formerly resided. Ortus Mallum, the original home of the Ancients, also resides on Celestis. The Ancients were forced to flee from their homeworld millions of years ago due to the warmongering actions of their brethren: the Ori. (SG1: "Origin", "The Ark of Truth")
Known locations on Celestis
Behind the scenes
The Lewis and Short Latin Dictionary defines caelestis as, "pertaining to heaven, heavenly, celestial," or metonymically as, "divine, god-like," or substantially, "the gods." Definition of Caelestis