This just about says it all, though I will quote from the book “Rocket Men” referring to those that have gone into space:

“They have something, a sort of wild look. I would say, as if they had fallen in love with a mystery up there, sort of as if they haven’t got their feet back on the ground, as if they regret having come back to us… a rage at having come back to earth….. did you know that for months [they] went around looking at the sky? You could speak to them and they didn’t answer, you could touch them on the shoulder and they didn’t notice; their only contact with the world was a dazed, absent, happy smile. They smiled at everything and everybody, and they were always tripping over things. They kept tripping over things because they never had their eyes on the ground.”