Watching Bob's team strap the Pioneer 3 crew into their couches was a pointed reminder of how far we'd come - and how far we still had to go.

And I know I've already covered all of this but I think it only really sank in that afternoon. Founding the Kerbin Interplanetary Society. The long years of sounding rockets and struggles, trying to build something - anything - large enough to fit a crew capsule on. Kerbal 1 and Bill's photographs that set the world on fire. Orbital flight, the so-called Space Race (and I still loathe that media creation with a passion) with Rockomax. The CORDS programme and what came afterwards.

Then came the Kerm crisis. We launched the day after the news broke.

The Pioneer 1 crew ventured a thousand times further into space than anyone else before them. They circled the Mün and became the first kerbals in history to watch Kerbin rising over a new horizon.

Pioneer 2 may have been less obviously impressive to the kerbal on the street but it was the vital next step. We flight-tested the entire Pioneer spacecraft from lander to capsule and back again. Between them, the crew managed to simulate almost every part of a Munar landing without ever going near the actual Mün.

That would be a job for Pioneer 3.

- Jebediah Kerman: KIS - a History of Kerballed Spaceflight.