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|2015 2016 2017 2018 2019 2020 2021|
|1980s 1990s 2000s 2010s 2020s 2030s 2040s|
|20th century - 21st century - 22nd century|
- Advancements in sublight propulsion technology make sleeper ships obsolete. (TOS: "Space Seed")
- Development of first impulse engines. (TOS novel: The Rings of Time)
- The Dax symbiont is born on Trill. (DS9: "You Are Cordially Invited")