A Few Good Coders — asset credits

Planet textures
Solar System Scope / INOVE
Source: https://www.solarsystemscope.com/textures/
License: Creative Commons Attribution 4.0 International (CC BY 4.0)
https://creativecommons.org/licenses/by/4.0/
Textures resized for web rendering. Earth and starfield WebP derivatives are
re-encoded from the attributed JPEG maps at quality 85; originals are retained.
The Earth startup preview is a 512 x 256 WebP derivative (quality 75).
Cloud coverage is a 1024 x 512 grayscale WebP derivative (quality 78).

Lunar color and elevation
NASA's Scientific Visualization Studio, LROC / LOLA
Source: https://svs.gsfc.nasa.gov/4720/
Adapted for real-time rendering.
The lunar startup color map is a 1024 x 512 WebP derivative (quality 80).
Original high-resolution color and elevation maps remain available on selection.