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Considering that reliable ignition is always a concern with non-hypergolic fuels, I was just wondering: why don't they include two small tanks of hypergolics to light up a 'pilot light', instead of using electric ignition? Especially for anything left in space for a while, it seems much more reliable to me; rather than mess around with stuff that has been exposed to space and you aren't sure about, use a shuttle RCS engine to give the main engine a light.
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