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Exit Star Trek v2.0, enter The Motion Picture
At a meeting at Paramount, studio head Michael Eisner formally cancels plans for a Star Trek television series reuniting the original cast (a decision made easier by the other networks strong-arming potential advertisers into freezing out Paramount’s network startup attempt) and sets the wheels in motion to revamp the pilot script, Alan Dean Foster’s In Thy Image, into a feature film. Contracts for the series are renegotiated (or in some cases cancelled) for the movie, but scriptwriters and designers continue to work on Trek TV scripts just in case the movie leads to a small-screen resurgence. The impetus for finally getting the long-stalled Star Trek movie underway? 20th Century Fox’s runaway success with Star Wars.
The Soviet-launched Salyut 5 military space station tumbles out of its orbit, having exhausted the fuel needed to keep it in a controlled orbit of the Earth. The two-ton space station burns up on re-entry, having been visited by only two crews; another mission to Salyut 5 had been planned, but its fuel depletion made that flight too risky to undertake.
Mere weeks before the launch of the first Voyager spacecraft, NASA swaps Voyager 2 and Voyager 1. Repeated failures have plagued the attitude and articulation control and flight data subsystems in the spacecraft designated VGR77-2, leaving mission planners with doubt about its flightworthiness. VGR77-3 thus becomes Voyager 2, and VGR77-2 undergoes repairs to correct its problems before being designated Voyager 1. The two vehicles’ thermonuclear power sources are swapped, as whichever one is Voyager 2 will require a longer-lasting power source to power all instruments for possible visits to Uranus and Neptune following the 1981 Saturn encounter. (A third vehicle, VGR77-1, is an engineering test spare which eventually goes on display at the JPL campus in Pasadena.)
Released from its 747 Shuttle Carrier Aircraft in mid-air for the first time, and airborne on its own for the first time, the Space Shuttle Enterprise takes wing over the dry lake bed at Edwards Air Force Base for a test landing. With no engines on board (a test shuttle that will never go into orbit, Enterprise isn’t equipped with them) and only one shot at a safe landing, Enterprise successfully touches down on the runway after a flight lasting only a few minutes, validating the unpowered approach method of landing a shuttle just returned from space.
NASA launches the first High Energy Astronomy Observatory satellite in Earth orbit, continuing the survey of the sky with sensitive detectors designed to find gamma ray and X-ray sources. HEAO-1 will remain in service through January 1979, and will re-enter Earth’s atmosphere in March 1979.
Mercury Records releases 
Radio astronomers at Ohio State University observe a signal from the direction of the constellation Sagittarius that seems to jump out from the usual cosmic background noise. The 72-second signal is quickly dubbed the “Wow Signal” (thanks to a hastily scribbled note), and is considered by some to be a strong candidate for a message from an extraterrestrial civilization since its frequency falls almost exactly on the hydrogen line of the electromagnetic spectrum, a wavelength closely watched by the SETI program. But more powerful telescopes listening in on the same region of space in the years and decades to come pick up no further signals. Scientists involved in the initial analysis later admit that the “message” may be of Earthly origin, reflected back from an object in space.
NBC airs the seventh episode of Quinn Martin’s horror/sci-fi anthology Tales Of The Unexpected. (This series is not to be confused with the longer-lived British series of the same name, created by acclaimed author Roald Dahl.) Joanna Pettet and Gary Collins (The Sixth Sense) guest star. (The series has already been cancelled at this point; NBC is burning off the remaining episodes into off-season time slots.)
NASA launches Voyager 2 (weeks ahead of Voyager 1), giving the unmanned space probe the best shot of taking advantage of a favorable planetary alignment known as the “Grand Tour”. Using a series of carefully calculated gravity assists, Voyager has the potential to visit all four of the major outer gas planets – Jupiter, Saturn, Uranus and Neptune – in under 15 years without having to expend fuel to make the trip. If Voyager 2 survives long enough to visit Uranus or Neptune, it will become the first man-made spacecraft to visit either planet.
Mushroom Records releases the third Split Enz album,