The Kerbal Space Program Blog announces the release of Kerbal Space Program version 1.0, marking the official launch of the launch simulation. The update is now available on the KSP Store, Steam, and GOG.com, and the complete changelog can be found on this page. Here's an overview:

This is a special one! After four years in development, Kerbal Space Program 1.0 is now officially released!

Kerbal Space Program 1.0 is what we envisioned when development of the game started four years ago: we set out to make a game in which the player is given ultimate control over the exploration of space: from designing their rockets to launching and flying them to their destinations, in a universe that was modelled to have be as realistic as possible while remaining fun to play in.

However, our 1.0 release is more than just a new version number. It’s also the biggest update to the game we’ve ever done, and contains many new and updated features, plus improvements to just about every game system, which we’re sure will appeal to both newcomers and seasoned veterans.