Virgin Galactic's space tourism rocket SpaceShipTwo achieved its first solo glide flight yesterday, marking another step in the company's eventual plans to fly paying passengers.
If we can go to space with improved hybrid rocket engines on half the fuel used now, that would be a giant step.
如果我能够坐在相当于只使用现今火箭所需一半燃料的改良型火箭上太空的话，那将会又是迈出了很大的一步。
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Private spaceflight took one giant step forward this week when the Tycho Brahe craft lifted off atop the HEAT-1X rocket engine Friday (pictured) from a platform in the Baltic Sea.