I've been messing around with this some more recently. There's a new 0.16 update out which adds the option of EVA's, or "extra-vehicular activity", which is just a fancy term for having your Kerbals do space walks or moon walks (or Kerbin walks if you fancy that). They're equipped with a jetpack so you can float around neatly.

Anyway, I've learned a lot of stuff about space flight and inter-planetary travel. Somewhere before I said I got up as high as 700km which felt like an achievement but god, that is just the totally wrong way to go about it. I've learned about orbits, about periapsis and apoapsis, transfer orbits and how to get your spaceship up in a stable orbit with a small "eccentricity".

While I guess it's not incredibly hard to get a spaceship to the moon, there is a lot of stuff to take into account and quite some physics knowledge required to understand what you're doing.

Oh and the best thing I discovered is that you can build space planes as well, that take off like normal planes, fly through space, and land again. I don't think they're suitable to fly to the moon though.

And if you don't plan on playing this, but would like to experience it, definitely check out Northernlion's set of videos where plays this. He absolutely sucks balls at it and has no clue what he's doing, but it is hilarious.

Yes, the game continues further than you'd think, how to do orbits and land on other planets and get back with enough fuel, there's such a plethora of goals you could have in this game. Once you can do rockets, you can try space planes. Really cool idea and I'd like to see it succeed.

I think it allows them to be a bit looser in how they implement things. People tend to be more critical about unrealistic physical properties when they recreate our solar system.

lol, you landed a penis on the moon