|years:|| 1970 1971 1972 1973 1974 1975 1976
|decades:||1940s 1950s 1960s 1970s 1980s 1990s 2000s|
|centuries:||19th century - 20th century - 21st century|
- Nearly half a dozen of the top Soviet biochemists and geneticists, including Pavlinko, Lozinak, and Malinowycz go missing.
- 15 April : At United States Military Forces Headquarters, Colonel Robert Argon composes a letter to Franz Joseph, explaining that a large amount of stored data in the Omaha Military Forces Base was found to be a hoax download of a future technical document, complete with illustrations and other official-looking printout data.
- The United States of America place the first space station in orbit, Skylab, its purpose is to further the research the effect of weightlessness. 
- ↑ 1.0 1.1 TOS novel: The Rise and Fall of Khan Noonien Singh, Volume 1
- ↑ TOS novel: The Rise and Fall of Khan Noonien Singh, Volume 2
- ↑ ST website: Startrek.com.
- ↑ ST reference: Star Fleet Technical Manual
- ↑ TOS reference: Star Trek Space Flight Chronology
- TOS comic #18: The Hijacked Planet
- TOS comic #19: The Haunted Asteroid
- 8th: "Beyond the Farthest Star" is the first episode of Star Trek: The Animated Series to be aired.
- 15th: "Yesteryear" is first aired.
- 22nd: "One of Our Planets is Missing" is first aired.
- 29th: "The Lorelei Signal" is first aired.
- TOS comic #20: A World Gone Mad
- 6th: "More Tribbles, More Troubles" is first aired.
- 13th: "The Survivor" is first aired.
- 20th: "The Infinite Vulcan" is first aired.
- 27th: "The Magicks of Megas-Tu" is first aired.
- 3rd: "Once Upon a Planet" is first aired.
- 10th: "Mudd's Passion" is first aired.
- 17th: "The Terratin Incident" is first aired.
- 24th: "The Time Trap" is first aired.
- TOS comic #21: The Mummies of Heitius VII