It might be the most mind-boggling photograph humanity has ever taken.
When you see photographs of the Earth from far away, the implications may not immediately be clear. This puts it all into perspective.
Unilever and the United Nations
This photograph of Earth taken by Voyager 1 was dubbed "Pale Blue Dot."
For more videos featuring the calming bass of Carl Sagan's voice, check out The Sagan Series on YouTube.