X-1 was made to investigate that Place — and finally fly outside of it, getting a supersonic craft. From his early years as being a fighter ace in planet War II to the final time he broke the audio barrier in 2012 - https://janicenukw681696.blogoscience.com/35985561/5-simple-statements-about-the-first-supersonic-plane-in-the-us-by-chuck-yeager-explained