Before the Apollo Moon landings, NASA’s Ranger missions were early robotic pathfinders to the Moon. Many of them failed because NASA’s engineering methods were still developing and processes were weak. This video shows the history of how early problems with cleanroom discipline caused failures, and how those lessons helped NASA build the strict engineering practices that later made the Apollo program successful. #SpaceMissions #ApolloProgram #NASA #SpaceEngineering #NASAHistory