C-O-N

I spent hours designing and building a reusable rocket capable of taking huge payloads anywhere in the solar system. I decided that its maiden voyage would be a grand tour of the Jool system. After I had docked the 2 SSTO planes for Laythe and one of the 2 landers for the other moons, I went to go and launch the other lander, but instead of hitting "Space Center" I hit "End Flight." I eventually rebuilt the ship and it works great.