They needed smarter astronauts.
Seems if the Apes who had problems with the concept of paper air planes in the first film, could figure space travel before the end of the second,than the astronauts should have had a walk in the park.
shareWell, Milo was supposed to have been an Einstein equivalent, so he was a special case. Zaius of course knew that humans had once been capable of flight, which was kept a secret. The orangutans were pretty manipulative and made sure the rest of the apes were kept in the dark.
share