[post_page_title]X-15[/post_page_title]
The X-15 is rocket-powered, man-made aircraft that accelerate to a speed of 4,520 miles per hour. The X-15 made its initial debut in the skies on June 8, 1959, and flew a total 199 flights during its employment by the United States Military.
The cost to fund such a fast and technologically advanced expenditure was a startling $300 million. The program that financed and built the X-15 jets was retired after it served its purpose – to help create a more efficient shuttle for NASA.
Healthy snacks you can easily make yourself
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