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Notes -
Two beams of cold exhaust (more efficient that way, even), each angled epsilon radians off center in opposite ways, would be basically invisible but would still be 100% minus epsilon squared as efficient.
The bigger reason there's said to be No Stealth In Space is heat - your power plant will have to radiate a ton of waste heat, your life support will be warm, etc. But the catch is that your radiators don't have to be omnidirectional. A peer doesn't care; they can have a network of sensors in every direction ... but hiding from 21st century Earth would be easier.
I still don't believe in alien visitors. You can't hide the Dyson cloud they came from. If their tech can't get a Dyson cloud (enough orbital colonies to occlude their star noticably) operational they probably can't get here either; if their science is so advanced they don't need a Dyson cloud then they probably won't screw up and be seen while they're here. If their tech is still in flux ... why? the Universe is billions of years old; it would require a huge coincidence for the most advanced alien intelligence in our galaxy to be mere millenia ahead of us rather than eons ahead or behind.
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