A grainy black shape floating above Earth, captioned as a 13,000 year old alien spacecraft that NASA is hiding. This episode dissects the Black Knight satellite legend using the framework of Martina Redpath at Armagh Planetarium, who called it a stew of unrelated events stripped of context. The hosts trace the ingredients back to Nikola Tesla’s 1899 rhythmic radio signals in Colorado Springs, which science writer Brian Dunning attributes to pulsars not identified until 1968, and to Jorgen Hals’s 1928 long delayed echoes in Oslo, now understood as radio waves trapped in ionospheric plasma ducts.

From there the episode follows the Cold War additions: Donald Keyhoe’s 1954 mystery satellite claims made during a book promotion tour, the February 1960 Navy radar detection of a dark polar-orbit object that turned out to be a fragment of the Discoverer 8 casing, the British Black Knight rocket program of 1958 to 1965 that never orbited anything but donated its name, and the Gordon Cooper Mercury 9 UFO rumor absent from every transcript and denied by Cooper himself. The hosts then cover Duncan Lunan’s 1973 star map interpretation pointing to Epsilon Bootis, later retracted by Lunan, and the famous 1998 STS-88 photograph, which James Oberg and NASA records identify as a trunnion pin thermal cover that slipped away from astronauts Jerry Ross and James Newman and burned up days later.

• Why Tesla’s mystery signal was likely a dead star’s heartbeat
• Long delayed echoes and how the ionosphere can hold a radio signal for seconds
• A book stunt, a radar scare and a borrowed British rocket name
• Pareidolia and the retracted star map that gave the myth its 13,000 year timeline
• The STS-88 space blanket and why the internet ignored the explanation