Virgin Galactic confirms that following a series of successful hot-fire rocket tests, it has reverted to an improved form of the original rubber-based fuel for powering the company’s suborbital SpaceShipTwo (SS2), the second version of which is nearing completion in Mojave, California. Virgin Galactic—which plans to resume flights of SS2 in 2016—used a recently developed and more energetic nylon-based fuel for last October’s ill-fated fourth and final powered flight ...

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