Jupiter surface: Jupiter Global Map (2019), Hubble OPAL.
Credit: NASA, ESA, A. Simon (NASA Goddard), M. H. Wong (UC Berkeley).
Source page: https://science.nasa.gov/asset/hubble/jupiter-global-map-2019/
Source asset: https://assets.science.nasa.gov/dynamicimage/assets/science/missions/hubble/releases/2019/08/STScI-01EVSV9A3VN7VYXN5H6Z1GDG93.tif?w=2000
The downloaded JPEG is stored unchanged. Texture UVs omit its unmapped polar margins.

Saturn ring profile reference: NASA Saturnian Rings Fact Sheet.
https://nssdc.gsfc.nasa.gov/planetary/factsheet/satringfact.html
Radial ring opacity/color is procedural illustration, not a photographic measurement.

Earth surface: NASA Blue Marble — Land Surface, Ocean Color and Sea Ice (2002).
Credit: NASA/GSFC, Reto Stockli and the Blue Marble team.
Source asset: https://eoimages.gsfc.nasa.gov/images/imagerecords/57000/57730/land_ocean_ice_2048.jpg
The 2048 x 1024 JPEG is bundled unchanged as earth-daymap.jpg.

Sun surface: Solar System Scope / INOVE, based on NASA imagery data.
Source page: https://www.solarsystemscope.com/textures/
Source asset: https://www.solarsystemscope.com/textures/download/2k_sun.jpg
License: Creative Commons Attribution 4.0 International (CC BY 4.0).
https://creativecommons.org/licenses/by/4.0/
The 2048 x 1024 JPEG is bundled unchanged as sun-surface.jpg.
The creator's map has tuned colors and filled gaps; it is an illustrative surface,
not live solar imagery. The application applies self-lit rendering and optional color tint.

Moon surface: Solar System Scope / INOVE, based on NASA elevation and imagery data.
Source page: https://www.solarsystemscope.com/textures/
Source asset: https://www.solarsystemscope.com/textures/download/2k_moon.jpg
License: Creative Commons Attribution 4.0 International (CC BY 4.0).
https://creativecommons.org/licenses/by/4.0/
The 2048 x 1024 JPEG is bundled unchanged as moon-surface.jpg.
It is an illustrative cratered surface map, not live lunar imagery.

Saturn surface: Solar System Scope / INOVE, based on NASA imagery data.
Source page: https://www.solarsystemscope.com/textures/
Source asset: https://www.solarsystemscope.com/textures/download/2k_saturn.jpg
License: Creative Commons Attribution 4.0 International (CC BY 4.0).
https://creativecommons.org/licenses/by/4.0/
The 2048 x 1024 JPEG is bundled unchanged as saturn-surface.jpg.
It is an illustrative cloud map with tuned colors, not live Saturn imagery.