For millenia, for as long as anybody can remember or the history books can tell, Kerbals have been renowned for their extraordinary Kurm hunting. The Kurm, being somewhat like a little green burrowing fox, is difficult to hunt and track because it spends much of its time under the soil; thus, Kerbals are perpetually staring at the dirt, digging and hunting for their elusive prey.
Until one day a young Kerbal, while digging after a particularly energetic Kurm he was hunting, suddenly found the creature — now cornered against a large boulder — turning upon him! It bit him on the finger, and the young Kerbal yelped in surprise (Kurms are not aggressive creatures, so this was a very shocking turn of events!) and lurched backward, tripping over an exposed rock behind him. Totally off-guard and already off-balance, he tumbled backward and smacked his head on another rock.
Rubbing his aching head, this young Kerbal blinked his eyes repeatedly, trying to get the stars in his vision to clear. Until he realized that the stars were not, in fact, in his vision — they were actually above his head! Amazed and bewildered, he stood up, and stared at the sky.
For the first time in history, a Kerbal looked up. And lo! were the stars discovered.
But that was not all! As he stared at the stars, trying to count them, sweeping his gaze across the sky, his eyes were caught by another one, much bigger yet somehow quite different from the other stars.
And thus was Mun discovered.
The young Kerbal immediately went and grabbed his two best friends, and brought them to the site of his discovery to show them. They were not impressed by the bright blue sky with the painfully-bright yellow circle, but their friend was so excited he yammered on and on and on about it all day.
And then they saw what he had been talking about, and they, too, were mesmerized.
The three friends set about on that very spot to invent the science of rocketry, so that they could go up and investigate these stars themselves. They soon realized rockets alone were not sufficient, and began construction on the KSC (at the time it stood for Krums Suck Cronk, but they later revised it to something that seemed more rocket-y).
It wasn’t long thereafter that the three friends oversaw the construction and launch of Kerbin’s first ever failed rockets. (Eventually they oversaw the first successful one, too, but that was far less exciting.)
The history books are already being updated to include these three visionary Kerbals: Jebediah “Jeb” Kerman, the first Kerbal to look up, and Bill and Bob Kerman, the second and third Kerbals to look up (they still to this day argue over which of them was the third, as neither wants to admit that they believed Jeb at all — and who can blame them?).