Image by Przemyslaw "Blueshade" Idzkiewicz. Following third-party images were used to create this image:
"Earth's City Lights" [1],
and "The Blue Marble: Land Surface, Ocean Color and Sea Ice" [2].These images come from an archive of American government agency, NASA and as such, they constitute "public domain" content.
Illumination maps were created using "Home Planet" [3] by John Walker.

This image is hereby released under cc-by-sa license.
Own work
Llywelyn2000