* Astronomy

 We're used to seeing transparent vortex chambers in vacuum cleaners, but what about in a liquid rocket engine? Orbitech of Madison, Wisconsin, are doing for rocket engines what Dyson did for vacuum cleaners.
In a traditional liquid rocket engine the combustion chamber is cooled by passing fuel through a double wall around the engine. This works well, and reclaims lost energy, but it's difficult and expensive to build.

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