Just saw this on the NASASpaceflight forum:
NASA - The Frontier Is Everywhere.
Great piano piece by Michael Marantz accompanying the video. There are a few YouTube video's featuring this reading by Sagan of his book Pale Blue Dot. This is one of the better one's with Marantz's excellent piano piece.
BTW, there is a word in the audio Sagan uses "terraqueous" I hadn't heard before. It simply means consisting of land and water.