Noun
final frontier
(poetic, slang) Synonym of outer space
This is space. It's sometimes called the final frontier. (Except that of course you can't have afrontier, because there'd be nothing for it to be a frontier, but as frontiers go, it's pretty penultimate...) Terry Pratchett
If you look at the field of robotics today, you can say robots have been in the deepest oceans, they've been to Mars, you know? They've been all these places, but they're just now starting to come into your living room. Your living room is the final frontier for robots. Cynthia Breazeal
ISBN 0-310-21538-2 * Sanford Schwartz (2009), C. S. Lewis on the Final Frontier: Science and the Supernatural in the Space Trilogy. Source: Internet
A Star Trek collection also rates its own tree with blue lights, star tinsel and lots of silver, Final Frontier fantasy. Source: Internet
There is a "cat dancer" - a female cat humanoid who appears in Star Trek V: The Final Frontier - who has jokingly been referred to as a Kzinti, but that has never been officially confirmed. Source: Internet