The world's largest aeroplane by wingspan has taken flight for the first time
The idea is to fly the plane to 10 km (6.2 miles) before releasing satellites into orbit.
Its 385 ft (117 m) wingspan is the length of an American football field.
If successful, such a project would be a cheaper way to launch objects into space than rockets fired from the ground.
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The twin-fuselage six-engine jet flew up to 15,000 ft (4,572m) and reached speeds of about 170 miles per hour (274 km/h) on its maiden flight.
The pilot Evan Thomas told reporters the experience was "fantastic" and that "for the most part, the
British billionaire Richard Branson's company Virgin Galactic has also developed aircraft that launch rockets into orbit from
Stratolaunch describes its vessel as the "world's largest plane" but there are aircraft which are longer from nose to tail.
Watch a video of its first flight below;