 revealed that even out and away from the Earth at over 4 billion miles, scientists have run experiments, George, to cancel all the light from stars and galaxies and other sources of light in space. They've come up with what appears to be a still unknown source of light, which creates a glow of some type. Many believe that this is not the cosmic background radiation glow of the Big Bang, but there's still light coming from somewhere. So, George, here's the latest theory. The mysterious concept of dark matter.