NASA engineers are running checks to solve the mystery of why the Falcon 9's engine failed to perform a routine maneuver to lower the rocket's altitude.

SpaceX’s Falcon 9 rocket is grounded again after the vehicle’s second stage did not come down in the expected area of the ocean, following an otherwise successful mission that delivered a Dragon capsule and its crew to orbit.

Elon Musk founded corporation SpaceX has grounded its Falcon 9 rockets temporarily after they faced a malfunction during the launch of a rescue mission for two astronauts, who were stranded