While the plane’s engines were still audible on the ground, surpassing the Mach cutoff ensured no one heard a disruptive sonic boom. According to the company’s February 10th announcement ...

So what was it? Most likely, it was a sonic boom caused by a returning SpaceX Dragon capsule. According to a tweet from SpaceX, the capsule splashed down just after 11 p.m. in the Gulf of Mexico ...