For millennia the kerbal kind lived and grown in underground caves, that were comfortable and worked well with his no-very-smart and wild life style. The kerbals thought the universe was an infinite potato, crossed by his galleries . They believed that everything revolved around them... Some dared to rise to the Kerbin surface (without much interest and by necessity) but none of those trips transcended until Colon Kerman, a former adventurer, who claimed to have discovered that Kerbin it was