Earthrise, an iconic photo showing the earth rising over the moon's horizon, was taken 50 years ago, and changed the way we look at ourselves and our position in the universe. Former astronaut and ISS Commander Chris Hadfield and the crew of the Apollo 8 mission -- and the impact it had.

The Apollo 8 crew spoke with Constellation (www.constellation.earth), a non-profit organization co-founded by astronauts and dedicated to sharing their stories from space.