Apollo 8 and how they made that photo

"Nowadays people don't stop to think twice about what they're seeing—that precious blue jewel engulfed in the pitch black nothingness of space. However, this was a vision that deeply affected the view of ourselves as species and our place in the world and the universe. Earthrise truly made everyone realize that we're all living in a fragile tiny ball that we needed to protect in order to survive. Humans are—for now—alone in the void"