Planet surface imagery: Solar System Scope / INOVE
https://www.solarsystemscope.com/textures/
Licensed under Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/

Source assets: 8k_earth_daymap.jpg, 8k_earth_clouds.jpg,
8k_earth_nightmap.jpg, 8k_jupiter.jpg.
Changes: WebP encoding; clouds converted to grayscale at their native 8192-pixel width;
night map resized to 4096 pixels wide. Other maps retain their native 8192-pixel width.
A separate 4096-pixel grayscale cloud derivative is provided for smaller devices and slow connections.
Rendered with custom lighting, atmospheric scattering and cloud shaders.