There are no texture files and no audio files. The Earth is generated at load: real coastlines carried as lon/lat polygons then warped by three octaves of value noise into fjords and capes, latitude biomes, a continental shelf from a blurred landmask, weather-banded cloud on its own clock, city lights weighted to temperate coasts on the night side, ocean-only sun glint, and a 23.4 degree tilt. The solar system runs in its own scene with the depth buffer cleared between passes, which is also what lets the Earth correctly eclipse the Sun.