Earth day texture
Source: NASA/Goddard Space Flight Center Scientific Visualization Studio
Title: Blue Marble - A Seamless Image Mosaic of the Earth
Source page: https://svs.gsfc.nasa.gov/2915
Credit: NASA/Goddard Space Flight Center Scientific Visualization Studio.
The Blue Marble Next Generation data is courtesy of Reto Stockli
(NASA/GSFC) and NASA's Earth Observatory.

Earth night texture
Source: NASA/Goddard Space Flight Center Scientific Visualization Studio
Title: Earth At Night
Source page: https://svs.gsfc.nasa.gov/2916
Credit: Data courtesy Marc Imhoff (NASA/GSFC) and Christopher Elvidge
(NOAA/NGDC). Image by Craig Mayhew (NASA/GSFC) and Robert Simmon
(NASA/GSFC).

The local WebP files are resized and compressed derivatives used only as
visual textures for the Sparrow Access globe.