The space vehicle launch company owned by the late Paul Allen, co-founder of Microsoft, has confirmed that it's still operational, following a report that it was closing shop. Earlier Friday, Reuters said four sources told it that Stratolaunch Systems Corporation would be closing down. Stratolaunch has been developing a series of space launch vehicles including a super-sized aircraft. In August 2018, the company unveiled a lineup of vehicles. The Stratolaunch plane was designed to launch a Pegasus XL rocket, with the company also designing three other launch vehicles including a three-core rocket that would carry 15 times the Pegasus payload,...