“I wept for the Earth because I realized it’s dying,” Shatner said.

“It was the death that I saw in space and the lifeforce that I saw coming from the planet — the blue, the beige and the white,” he said. “And I realized one was death and the other was life.” 

“I saw more clearly than I have, with all the studying and reading I’ve done, the writhing, slow death of Earth and we on it,” Shatner said.

“It’s a little tiny rock with an onion skin air around it. That’s how fragile it all is. It’s so fragile. We hang by a thread … we’re just dangling.”

William Shatner experienced profound grief in space. It was the overview effect : NPR