Apollo 7's main mission was to prove that a lunar orbit was possible. It encountered many problems such as windows fogging up because the anti-fogging systems were freezing and that their power cells were overheating at times. They overcame all of these and proved that a moon orbital and potentially landing was possible. All of the crew got a cold and had to blow their noses really hard and which in space, made their ears feel like they were going to pop which they didn't like. This mission was a key mission in the apollo program because it was the first mission to carry a camera on board and broadcast back to humans on earth.