At least some advanced civilizations might be producing tons of waste heat by now. And researchers are looking for them.
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Sources:
http://irsa.ipac.caltech.edu/IRASdocs/iras_mission.html
http://blogs.scientificamerican.com/life-unbounded/the-fastest-spacecraft-ever/
http://www.seti.org/seti-institute/project/details/fermi-paradox
http://phys.org/news/2015-04-advanced-civilizations-earth-obvious-galaxies.html
http://iopscience.iop.org/0004-637X/698/2/2075/pdf/apj_698_2_2075.pdf
http://www.sciencedirect.com/science/article/pii/0019103573901127
http://www.nature.com/scientificamerican/journal/v283/n1/pdf/scientificamerican0700-38.pdf
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