Fifty years ago today, astronauts orbiting the Moon captured a photograph that some people say changed the world. It was the first color photograph of Earth from space. Bill Anders, Jim Lovell, and Frank Borman took the unplanned picture from Apollo 8 just as the blue Earth began to rise over the pale lunar surface. KNAU’s Melissa Sevigny spoke with local space historian Bill Sheehan about why the “Earthrise” photo mattered in 1968, and still matters today.