July 28: Virgin Galactic founder Sir Richard Branson, right, celebrates the unveiling of mothership aircraft White Knight Two 'Eve,' named after his mother Eve Branson, left, at Scaled Composites hangar in Mojave, Calif. More than 250 customers have paid $200,000 or put down a deposit for the chance to be one of Virgin Galactic's first space tourists. A date for the first launch has yet to be announced.

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