NASA. From left to right: plane traveling considerably less than the speed of sound; plane traveling at the speed of sound (Mach 1); plane traveling faster than the speed of sound. NASA. Post author By Kathy Gill Post date 15 October 2022 No Comments on NASA. https://www.grc.nasa.gov/www/k-12/UEET/StudentSite/dynamicsofflight.html#sound Leave a ReplyCancel reply This site uses Akismet to reduce spam. Learn how your comment data is processed.