final frontier

From the introductory voiceover of Star Trek: The Original Series: "Space, the final frontier..."

final frontier

1. (informal) Synonym of outer space
   • 2016, Phillip Swarts, “Need to know, 2016: Air Force Space Command on the final frontier”, in Air Force Times‎:

     Space may be the final frontier and it’s starting to get awfully crowded.

   • 2016, Chris Carter, “Hedge funds head for the final frontier”, in MoneyWeek‎, archived from the original on 6 November 2016:

     Hedge funds head for the final frontier

   • 2015, “The final frontier: Israel signs agreement with UN space group"”, in The Times of Israel‎:

     The final frontier: Israel signs agreement with UN space group

   • 2015, “The final frontier for HACKERS: Experts reveal hi-tech extra-terrestrial cyberbattles to control surveillance satellites”, in The Daily Mail‎:

     Space, the 'final frontier', is rapidly becoming an extra-terrestrial battleground for corporate espionage and other types of cyber attack as hackers seek to gain commercial advantage from rival networks operating in the $330-billion space economy.

   • 2015, Glenn Harlan Reynolds, “Cashing in on the Final Frontier”, in USA Today‎:

     With all the troubles here on planet Earth, it’s comforting that things are at least looking up for the Final Frontier.

   • 2013, James Fallows, “Mars, Our First Outpost on the Final Frontier”, in The Atlantic‎:

     Mars, Our First Outpost on the Final Frontier

   • 2012, Neil deGrasse Tyson, “Back to The Final Frontier”, in Discover‎:

     Back to The Final Frontier

• high frontier
• Last Frontier