There's a new biggest-plane-in-the-world.
The Stratolaunch has a 385-foot wingspan, is 238 feet long, weighs 500,000 lbs, has 28 wheels, and has a maximum takeoff weight of 1.3 million lbs.
It will be used to launch rockets into low-earth orbit.
Stratolaunch Systems Corporation is owned by Microsoft founder Paul Allen.
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