My theory of Kerbal evolution and why they care about space. Ancient Aliens! Nonsense aside, let\'s start from the beginning. Plant life= Native to Kerbin. It evolved from bacteria and dirt long ago. Originally to grass, which some mutated and grew into bushes, and some off the bushes muted into trees. Kerbals= Due to them being a male-only species so far, i have concluded that they may be a hive race, all birthed by a queen that reproduces with grass. The queen= If she/it does exist, i believe it was a very very fat blob of stuff, that managed to crash on Kerbin. Thus they came from space, which sparks their interest in going to the moon and beyond. Thus, it\'s not aliens, but it\'s aliens...