In December of 1968, the crew of Apollo 8 became the first people to leave our home planet and travel to another body in space. But as crew members Frank Borman, James Lovell, and William Anders all later recalled, the most important thing they discovered was Earth.
https://moon.nasa.gov/resources/332/earthrise-the-45th-anniversary
The descriptions of awe, connection, and transcendence Lowell, Borman and Anders said they felt that day when they looked back at Earth would be echoed by future astronauts.
You develop an instant global consciousness, a people orientation, an intense dissatisfaction with the state of the world, and a compulsion to do something about it. From out there on the moon, international politics look so petty. You want to grab a politician by the scruff of the neck and drag him a quarter of a million miles out and say, “look at that, you son of a bitch.”
Astronaut Edgar Mitchell
www.longnow.org/ideas/02018/05/29/overview-earth-and-civilization-in-macroscope