The Pale Blue Dot Celebrated

This week marks the 20th anniversary of a photograph. It's a very dramatic photo, even though, at first glance, it's mostly dark and seems to show nothing at all. But if you look closely, you can see a tiny speck of light. That speck is the Earth, seen from very, very, very far away and taken by spacecraft Voyager 1 back in 1990. NPR story and audio help us celebrate. Thank you Carl Sagan.