Carl Sagan was an astronomer who hosted several successful popular science shows in the 1970s and 80s. He was deeply involved in bringing different aspects of science to public attention and also made some groundbreaking contributions to the research into extraterrestrial life. He believed that the existence of other technological civilizations was highly probable, but that these civilizations also have a strong tendency to self-destruct and are therefore not as easy to make contact with as one would statistically expect. In this musical tribute, Sagan is accompanied by fellow space scientist Stephen Hawking. Click “Read More” for the video.