Eeyup,they're like the supreme rulers of Equestria and stuff..so yeah..you know its kinda like the Fim Fiction "Past Sins" when in the s1 ep1 Celestia Disappeared and Nightmare was now there,in the fanfic it 発言しました that maybe Luna banished her to the sun after she escaped the moon and then >> elements of harmony >> NMM defeated and back to normal >> Celestia suddenly appearing from the sky? (in fanfic: または when Nyx trapped them inside the sun and the moon respectively)