Mims解释道，混合动力火箭引擎的确存在，那就是维珍银河飞船1号(Virgin Galactic ' s SpaceShipOne)飞行器，不过在广泛投入使用之前还存在着一些关口未被突破。
Mims explains that hybrid rocket engines do exist, notably in Virgin Galactic's SpaceShipOne spacecraft, but there are several sticking points for widespread adoption.
2011年维珍银河航天公司准备首次将宇宙飞船2号发射到太空。
Virgin Galactic's SpaceShipTwo is due to launch into space for the first time in 2011.
最近，这位物理学家和他已经长大的儿子一起计算了宇宙飞船花10年时间横穿银河系的情况。
More recently, the physicist and his now-grown son calculated the scenario of a spaceship trying to travel halfway across our Milky way galaxy in just 10 years.
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