What is the “Black Knight” satellite? It is a mysterious satellite, of unknown origin, discovered in 1960 which shadowed Sputnik. It is believed to have been of extraterrestrial origin, and signaled back old radio waves from the 1920s and 1930s before it disappeared. In short wave patterns analyzed by astronomer Duncan Lunan, it revealed its origin as Epsilon Boötis (or the star system as it was 13,000 years ago): https://humansarefree.com/2011/06/alien-satellite-orbiting-earth-the-black-knight-complete.html