During the last few moments of Voyager I's mission, Carl Sagan had decided it to be appropriate to take one last photograph from space. He had taken a picture titled "The Pale Blue Dot", in which the Earth could be viewed from 3.7 billion miles away. It was the last picture to be taken by the Voyager itself. Between February 4th and June 6th of 1990, sixty frames had been sent to NASA by the Voyager. This was when telecommunication with the Voyager was on the edge of ceasing, causing the images to gain more and more distortion. The Voyager's mission ceased soon after.
This was a speech given by Carl Sagan in 1990 on the thought of seeing that pale blue dot, and it truly made me thing.