The phrase "blue yonder" means the vast and endless sky above us. It typically represents a sense of limitless possibilities or unknown future. Full definition
Week by week it has lifted a slim and quiet Negro youth — the University of Pittsburgh's Arnold Milton Sowell — higher into the wild blue yonder of recognition and acclaim. (si.com)
Discover the wide blue yonder inspired by the sublimity of Gravity with an accompanying fully orchestrated score composed by Mikołaj Stroiński (The Witcher 3, The Vanishing of Ethan Carter). (detachedgame.com)
It's funny how we spend so much effort exploring the wild blue yonder of outer space when so much of our own planet remains unknown. (treehugger.com)