Kerbal Space Program (commonly abbreviated as
KSP) is a
space flight simulator developed by
Squad for
Microsoft Windows,
OS X,
Linux,
PlayStation 4,
Xbox One, and
Wii U. In the game, players control an aerospace program, build and fly spacecraft or aircraft under physics simulation, and explore celestial bodies with characters called kerbals. The first publicly available version was released on the official
Kerbal Space Program store on June 24, 2011. The game also became available on
Steam's early access program on March 20, 2013. The game was officially released out of beta on April 27, 2015. The game has good support for game
mods and a large community to create them, which developed shortly after the game's initial release. Notable members of the space industry have taken an interest in the game, including
NASA and
Elon Musk of
SpaceX.