The further you travel into outer space, the more you realize our most important relationships are down here on Earth.
Astronauts have always looked back on their homeworld. They see the world as a fragile blue marble floating in the blackness of space when seen from the Moon. Astronauts can see the world with their own eyes flip through the pages of the book Story of astronauts living on the Moon, which holds all the people they love. That connection provides a sense of stability and reassurance that they will return after their mission.