The discoveries of science continue to show that the universe is riddled with mysteries that continue to elude even the most power instruments of modern technology. The more one looks, the broader and deeper the mysteries seem to become. One of these little advertised mysteries is known as the faint young sun paradox. According to what science knows about the development of stars such as the sun, the Earth should have been too cold in the past to have allowed for the development of life. Listen in as Philip and author Stuart Clark explore this fascinating mystery of science.