William Shatner experienced profound grief in space. It was the 'overview effect'
"I was crying," Shatner told NPR. "I didn't know what I was crying about. I had to go off some place and sit down and think, what's the matter with me? And I realized I was in grief."
While he wasn't sure what to expect, Shatner did not predict this. He had been excited to travel to space, and had thought about it for nearly 60 years, but didn't think he'd be overwhelmed with sadness, or that he'd go through "the strongest feelings of grief" that he's ever experienced.
There's a name for what Shatner felt: it's called the "overview effect." The term was coined by space philosopher Frank White in his 1987 book of the same name.
"The overview effect is a cognitive and emotional shift in a person's awareness, their consciousness and their identity when they see the Earth from space," White told NPR. "They're at a distance and they're seeing the Earth ... in the context of the universe."