Gemini 5 lifts off on the first manned spaceflight to last over a week, breaking the previous record held by the Soviet crew of Vostok 5; the eight-day flight is crucial in proving that humans could function for the minimum amount of time that a flight to the moon and back again would take. Instead of short-lived batteries, Gemini 5 is the first American spacecraft powered by fuel cells, another important step toward longer flights to the moon. The crew consists of Gordon Cooper and Pete Conrad.
London Weekend Television airs the seventh episode of the alternate-future-history series The Guardians, starring Gwyneth Powell and Cyril Luckham.
NASA launches the third and final Orbiting Astronomical Observatory satellite, given the nickname “Copernicus” when it successfully enters service near the 500th anniversary of the birth of the famed astronomer of the same name. OAO-3 is a joint venture between NASA and universities in the U.S. and the U.K., again focusing largely on ultraviolet observation of the sky, and it is instrumental in the discovery and study of long-period pulsars. OAO-3 will remain in service through February 1981, its successful nine-year mission lending weight to the ongoing construction and planning of NASA’s Space Telescope project, later to be known as the Hubble Space Telescope.
The British science fiction series Doctor Who is broadcast in the United States for the first time on WPHL, an independent commercial TV station in Philadelphia. WPHL is among the first American stations to have purchased a syndication package of Doctor Who episodes, starrring Jon Pertwee as the third Doctor, from BBC Enterprises by way of Time-Life Television. The package includes the series’ first two color seasons, plus the first story from the 
A&M Records releases 
The 27th episode of George Lucas’ historical adventure series The Young Indiana Jones Chronicles airs on ABC, starring Sean Patrick Flanery. Keith Szarabajka and Bob Peck (Jurassic Park) guest star.
Showtime airs the 82nd episode of The Outer Limits, a revival of the 1960s science fiction anthology series. Rene Auberjonois (Star Trek: Deep Space Nine) guest stars.
Pay cable channel Showtime premieres the 
The 
Atavistic Records releases 
Sci-Fi Channel airs 
Syfy airs the 40th episode of the science fiction series Eureka, starring Colin Ferguson, Salli Richardson, and Joe Morton. Billy Campbell (The Rocketeer) guest stars.
Australia’s Nine Network airs the