Explorer 1 was in solar orbit, when it picked up an unknown noise. It sounded like there were dolphins, but in space? Something was up. Explorer 2, which was planned to go into a low solar orbit, was launched. It now had a second objective, which was to find the space dolphins. Upon getting a high apoapsis, while burning to enter orbit, the noise was experienced again. The second objective was considered complete. During the Kerbin escape burn, it ended up having a Mun flyby. Sadly, it didn't enter Mun orbit. It is now in Kerbin orbit, and will soon prepare to have a Kerbin escape burn.