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By Brian Daniel
Mon, Wed, Fri
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Some of you may be asking why some engines have orange exhaust and others blue. The first person to come up with a good reason gets an invisible trophy.
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Joshua King ( anthro_arctic_fox) says:
There's two kinds of engines: ion engines (the blue ones) and there are the ones that use combustable fuels, or rocket fuel (the orange ones). I forget exactly what they're called, but you get the idea.
Jack Parkinson ( montec) says:
Combustion Engines?
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Surviving Mars is ? 2005 Brian Daniel
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