The limits of chemical rocket engines.

限制的化学火箭发动机。

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The spacecraft, with its nuclear rockets, would be launched on top of a conventional chemical rocket.

带有核燃料火箭的宇宙飞船可在普通化学燃料火箭上发射。

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Once in space, ion engines steadily propel a spacecraft until it travels faster than it would have using a chemical rocket.

一旦进入太空，离子发动机将稳步推进航天器，最终达到的速度会比使用普通火箭的更高。

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That's when researchers at Rocket Chemical Co. were trying to develop a petroleum-based substance to protect missile skins from moisture.

FORBES: Greasy Coca-Cola

Very little has changed since the early 1950s, when researchers at Rocket Chemical Co. were trying to develop a petroleum-based substance to protect missile skins from moisture.

FORBES: Johnny One-note

Only last week, Ukrainian customs officials seized a Russian cargo ship bound for Libya and carrying a multilaterally-controlled chemical used in the production of rocket fuel.

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