License: CC-BY-NC-SA
Includes code by Majiir (CompatibilityChecker, licensed as per source).
Includes artwork by dimonnomid and SpacedInvader and Dr. Walther and KillAshley in addition to NathanKell.
Includes biomes by Felger and grayduster and KellanHiggins and KillAshley.
Some planetary imagery is derived from work by Steve Albers and NASA / Jet Propulsion Laboratory, and some from the Celestia Motherlode (itself in the main sourced from JPL). Used by permission of the licenses for non-commercial release.