A late switch to a new rocket fuel earlier this year may have slowed Virgin Galactic’s bid to establish the world’s first suborbital spaceline service, but the operator’s plans have not stalled, nor has it been standing still. Eager to show progress with engine tests and new spaceship construction, Virgin’s efforts partly temper the evident frustration expressed by many who gathered here to mark the 10th anniversary of the X-Prize flights of SpaceShipOne in 2004. The ...

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