25 years ago today, Voyager I turned around to take a photo of Earth on its way to Saturn. You are looking at it. Our planet—6 billion kilometers (3.7 billion miles) away from the spacecraft—is that tiny pale blue dot, "a mote of dustsuspended in a sunbeam." It is one of the most important photos ever taken.
The photo was taken at the request of Carl Sagan, who convinced NASA that the photo was worth the cost even if it had no scientific value. This picture, he argued, will show us "our place in the universe." Many opposed this idea because pointing back at the Sun may damage the imager in the interplanetary probe. At the end, and thanks to the tenacity of many and with the help of NASA Administrator Richard Truly, Voyager I took this photo: