"We broke the sound barrier not once, not twice, but actually three times—each time without making an audible sonic boom,” Scholl said on Boom’s livestream. “It’s about how you fly the ...

But NASA’s newest X-plane, the X-59 QueSST, which is expected to fly in 2021, will provide data that will allow engineers to scale down those booms, so that they sound more like muted thumps.

Let’s learn more about the kākāpō “boom,” which you can hear here. As you can see in this YouTube video, the kākāpō makes an arresting sound. While most parrots have a variety of calls ...

Despite traveling at a top speed of Mach 1.12, no associated boom was picked up. “XB-1 broke the sound barrier three times ...