The main idea of "John Glenn and Friendship 7" is that Glenn's flight in Friendship 7 was successful, even though problems arose that could have caused it to fail. Which two details support this main idea?Select each correct answer. Glenn's heat shield was loose, so he left the retro-rocket pack in place to steady the heat shield. Glenn successfully flew the capsule manually when the automatic control system went out. Much of the world held its breath as Glenn orbited Earth three times. Big chunks of burning material flew by the window of Glenn's capsule upon reentry.