Clark Kent learned the details of his home planet Krypton very slowly, as there are few sources of information for him. When Clark was 14, his adoptive father Jonathan Kent told him that he came from another planet; Clark didn't know which one or anything about it. There were teleportation portals leading from Krypton to Earth, but were sealed by the Kryptonian Science Council so that General Zod and his followers could not escape, forcing Kara and Kal-El to get off the planet by taking along a three-year journey through space to reach Earth.