After nearly four years in playable alpha and beta, Kerbal Space Program is getting a full 1.0 launch on April 27, developer Squad announced.

Kerbal Space Program's full launch, for Linux, Mac and Windows PC, will add female Kerbals to the exploration corps (see them above). It appears Squad is counting down the days to launch with some short teasers, so check back with KSP's blog for more on what the full launch will contain.

The game has been available on Steam Early Access for almost two years. In Kerbal Space Program, players construct launch and orbital vehicles for the little green people, then attempts to fly them under the game's realistic physics model. It can be quite challenging for newcomers, but it's still amassed a very dedicated following — including employees of NASA.

For more on Kerbal Space Program, see Polygon's in-depth profile of the eight-man studio that built it.