An artist's depiction of how SpaceShipTwo will separate from its mothership, or carrier aircraft, known as the "White Knight Two." Once the mothership-SpaceShipTwo vehicle assembly reaches 50,000 ft (15,240 m), SpaceShipTwo will separate and rocket at Mach 4 into suborbital space 360,000 ft (110,000 m) above the Earth. Credit: Virgin Galactic/sky26
