Rule 34 Dev - astronomy blue_body blue_feathers blue_hair book castle chart cutie_mark detailed_background dialogue duo feathered_wings feathers female feral fur green_eyes hair horn long_hair multicolored_hair night outside princess purple_body purple_eyes purple_fur purple_hair quadruped royalty short_hair sky star star_chart star_map stargazing starry_sky tail telescope text two_tone_hair wings figeater friendship_is_magic hasbro my_little_pony mythology princess_luna_(mlp) twilight_sparkle_(mlp) equid equine mammal mythological_creature mythological_equine unicorn winged_unicorn english_text|758450350