Credit: Virgin Galactic The first Scot in space is to make history for a second time by taking control of a "milestone" rocket launch in New Mexico this afternoon. Dave Mackay, from the Scottish Highlands, is one of two pilots on board Virgin Galactic's VSS Unity, which is due to take off at 8am MT - around 3pm GMT. Sir Richard Branson's company is expected to begin space tourism flights in 2021, with Justin Bieber and Leonardo DiCaprio among the first 600 paying customers who have signed up so far. Today's flight will be the first of three final demonstration flights before the tourism service begins next year.