The Mandalorian: Chapter 19: The Convert
Streaming service Disney+ releases the the 18th episode of Jon Favreau’s The Mandalorian, starring Pedro Pascal. Katee Sackhoff and Katy O’Brian guest star in an episode directed by Lee Isaac Chung (Twisters). 
Batwoman: Off With Her Head
The CW airs the 15th episode of Batwoman, starring Ruby Rose and Rachel Skarsten.
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Batwoman now streaming on HBO Max
The Expanse: Pyre
The 18th episode of the science fiction series The Expanse, based on the series of novels by James S.A. Corey (a pseudonym for writers Ty Franck and Daniel Abraham), is broadcast on cable channel Syfy. Chad L. Coleman (The Orville) and Terry Chen (Continuum) guest star.
Arrow: Checkmate
The 108th episode of Arrow, a modern-day reboot of DC Comics’ Green Arrow superhero starring Stephen Amell, airs on the CW. Lexa Doig (Andromeda) guest stars.
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STS-119
Space Shuttle Discovery lifts off on the 125th shuttle flight, a 13-day mission to the International Space Station. Further spacewalks to repair the station’s solar arrays are conducted, as well as a repair to its on-board water system; with the power and water issues resolved, the station can now house a crew of six astronauts and cosmonauts. Aboard Discovery for her 36th flight are Commander Lee Archambault, Pilot Tony Antonelli, and mission specialists Joseph Acaba, Steve Swanson, Richard Arnold, John Phillips and Koichi Wakata. Wakata stays aboard the station, while ISS crewmember Sandra Magnus returns to Earth aboard Discovery.
Cassini captures clumping
The Cassini spacecraft is close enough to Saturn to observe unusual transitory “clumps” in the planet’s ring system. First spotted by the Voyager space probes in the early 1980s, these clumps zip around Saturn’s outermost rings, following the direction of the planet’s own motion, but until now it hasn’t been possible to get close enough to study those clumps. Unlike the Voyagers, however, Cassini won’t be zipping past the planet at the speed of a bullet – it will enter an orbit around the planet in July and keep an eye on things.
Pay cable channel Showtime premieres Dark Angel: Fuhgeddaboudit
The 36th episode of James Cameron & Charles H. Eglee’s cyberpunk series Dark Angel, starring Jessica Alba and Michael Weatherly, airs on Fox. Ashley Scott (Birds Of Prey, Jericho) guest stars.
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Stargate SG-1: 48 Hours
Pay cable channel Showtime airs the 100th episode of Stargate SG-1. David Hewlett (Stargate Atlantis), John de Lancie (Star Trek: The Next Generation), and Tom McBeath guest star.
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Stargate SG-1 now streaming on Amazon Prime
UPN airs the Crime Traveller: Fashion Shoot
The third episode of the time-travel/crime series Crime Traveller is broadcast on BBC1, created and written by Anthony Horowitz (Foyle’s War), starring Michael French (Casualty) and Chloe Annett (Red Dwarf). Alexis Denisof (Angel) guest stars.
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Sliders: Gillian Of The Spirits
Fox airs the 12th episode of Tracy Torme’s alternate-universe science fiction series Sliders, starring Jerry O’Connell, John Rhys Davies, Sabrina Lloyd, and Cleavant Derricks.
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Sliders now streaming on Amazon Prime
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Star Trek: DS9: The Nagus
The week-long national syndication window opens for the tenth episode of Star Trek: Deep Space Nine. Wallace Shawn (The Princess Bride) guest stars.
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Star Trek: Deep Space Nine now streaming on Paramount Plus
Dark Shadows: Episode Eleven
The 11th episode of a modern reboot of Dan Curtis’ gothic horror series Dark Shadows is broadcast on NBC, starring Ben Cross, Lysette Anthony, Roy Thinnes (The Invaders), and Jean Simmons.
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The first .com
Massachusetts computer manufacturer Symbolics Inc., a maker of LISP-based computers with customers ranging from the Defense Advanced Research Projects Agency (DARPA) to movie studios, registers the first .com internet domain name, symbolics.com. Ironically, despite being further ahead of the internet curve than nearly any other commercial entity, Symbolics struggles to last into the 1990s; both the company’s assets and its domain name will be sold off in the 21st century.
Doctor Who: Caves Of Androzani, Part 3
The 623rd episode of Doctor Who airs on BBC1. Robert Glenister (Life On Mars), Maurice Roeves (The Nightmare Man) and Christopher Gable guest star. This four-part story is the swan song of the fifth Doctor (Peter Davison).
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Doctor Who: The King’s Demons, Part 1
The 600th episode of Doctor Who airs on BBC1. Anthony Ainley guest stars as the Master, though his role in part one is credited to a pseudonym, “James Stoker” – an anagram of “Master’s Joke”.
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Doctor Who: Earthshock, Part 3
The 574th episode of Doctor Who airs on BBC1. This is the first Cyberman story since 1975’s Revenge Of The Cybermen.
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Tales Of The Unexpected: Galloping Foxley
ITV airs the 12th episode of Roald Dahl’s anthology series Tales Of The Unexpected, hosted by the author himself and adapted from his short stories. John Mills guest stars.
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Tales Of The Unexpected now streaming on Amazon Prime
Hitchhiker’s Guide To The Galaxy: Episode 2
The second episode of Douglas Adams’ breakthrough radio science fiction comedy series The Hitchhiker’s Guide To The Galaxy is first broadcast on BBC Radio 2. Mark Wing-Davey plays the role of Zaphod Beeblebrox for the first time, a character he will also go on to play in the series’ television incarnation.
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Doctor Who: Genesis Of The Daleks Part 2
The 393rd episode of Doctor Who airs on BBC1. This episode marks the first-ever appearance of Davros in the series, as well as the first attempt to nail down an origin story for the Daleks themselves.
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Six Million Dollar Man: The Rescue Of Athena One
The eighth episode of The Six Million Dollar Man is broadcast on ABC, starring Lee Majors and Richard Anderson. Farrah Fawcett Majors guest stars.
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UFO: The Long Sleep
The 26th and final episode of Gerry Anderson’s live-action UFO series airs on ITV, starring Edward Bishop and Michael Billington. Wanda Ventham guest stars in the curiously long-delayed series finale.
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UFO now streaming on Amazon Prime
Solid rocket boosters picked for shuttle
After a five-month design study focusing on alternatives to a winged (and manned) reusable first stage bosoter for the upcoming Space Shuttle, NASA settles on a configuration consisting of two solid rocket boosters strapped to the shuttle’s external fuel tank. Among the alternatives considered was the possibility of restarting production of the Saturn V rockets that launched Apollo and Skylab missions, with the shuttle and its fuel tank separating from the Saturn V’s first stage at high altitude (though in this configuration, a failure of the shuttle’s main engines would prove to be catastrophic). The SRB/tank configuration is expected to shave half a billion dollars off of the shuttle’s development costs.
Doctor Who: The Space Pirates, Part 2
The 239th episode of Doctor Who airs on the BBC. This is the second story written by Robert Holmes. Part 2 is the only intact episode of this story remaining in the BBC’s archives.
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Star Trek: Bread And Circuses
The 54th episode of Gene Roddenberry’s science fiction series Star Trek premieres on NBC. Long before contest-style “reality TV” exists, Roddenberry predicts it with unsettling accuracy, even if he’s a little bit off on the details. Ian Wolfe guest stars.
Lost In Space: The Colonists
The 54th episode of Irwin Allen’s science fiction series Lost In Space premieres on CBS, starring Guy Williams, June Lockhart, and Jonathan Harris.
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The Avengers: How To Succeed…At Murder
British broadcaster ABC airs the 103rd episode of the spy-fi series The Avengers, starring Patrick Macnee and Diana Rigg.
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Voyage To The Bottom Of The Sea: The Exile
The 27th episode of Irwin Allen’s adventure series Voyage To The Bottom Of The Sea airs on ABC, starring Richard Basehart and David Hedison. Ed Asner guest stars.
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One Step Beyond: The Explorer
ABC airs the 48th episode of the supernatural anthology series One Step Beyond, hosted and directed by John Newland. Gregory Morton guest stars.
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One Step Beyond now streaming on Amazon Prime