Stratolaunch is ending its development of a new line of launch vehicles that includes a space plane to concentrate on the airplane it has built at the Mojave Air & Space Port. The company had announced in August it would build a group of launch vehicles, including two versions of a medium launch vehicle that could carry payloads between 7,500 pounds and 13,000 pounds, and the reusable space plane that would eventually have a version capable of carrying a crew. Stratolaunch was founded in 2011 by the late billionaire Paul Allen to launch satellite-carrying rockets into orbit as a lower cost alternative to ground-launched rockets...

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