Planet in a distant galaxy, inhabited by the descendants of the Alterans. Celestis is the location of Ver Eger, a village populated by humans who worship the Ori. It may also be the location of the village of Ver Isca.
Avalon, Part 2 - Daniel and Vala enter the bodies of Harrid and Sallis, inhabitants of Celestis.
Origin - Daniel and Vala are taken to the Plains of Celestis from Ver Eger to have a face-to-face meeting with the Doci and the Ori themselves.
Stargate: The Ark of Truth - SG-1 takes the Odyssey through the Ori Supergate to visit Celestis in person, hoping to locate the lost Ark of Truth and bring an end to the war.