1968 was a year of unrest: many nations were at war. People marched for peace, fairness, and freedom. At the same time, the Apollo 8 crew was about to go farther into space than anyone had gone before―to the moon. As they surveyed the moon’s surface, astronauts aboard Apollo 8 looked up just when Earth was rising out of the darkness of space. They saw the whole planet―no countries, no borders. The photograph they took, Earthrise, had a profound effect when published widely back on Earth, galvanizing the environmental movement, changing the way people saw our single, fragile home planet, and sparking hope during a year of unrest.