The futuristic aircraft can reach supersonic speeds without producing deafening sonic booms.
This cutting-edge experimental aircraft will be capable of breaking the sound barrier without creating loud sonic booms.
The end of the spacecraft's current mission was marked by a series of sonic booms over Florida on Saturday.
Loud explosions have been occurring in the middle of the night in northeastern Sacramento for months.
The deafening sounds, which have been heard in dozens of locations this year, remain unexplained.
Law enforcement agencies have been left baffled by a spate of unexplained explosions in Fair Lawn.
Researchers have finally identified what has been causing loud booming sounds across the state.
Scientists have been attempting to determine what has been causing the spate of unexplained explosions.