One of the key developments separating modern civilization from the hunter gatherer societies of the past is the invention of farming, which took place about 10,000 years ago. This began with the cultivation of wild plants and the domestication of various animals for dairy products and meat.
Now a group of astronomers and astrobiologists say this atmospheric signature must be clearly visible from space and that a similar signal could also be generated by a farm on another planet. “The spectral signature of such an “ExoFarm” is worth considering in the search for technosignatures,” say Jacob Haqq-Misra at the Blue Marble Space Institute of Science in Seattle, and colleagues.
This produces vast amounts of ammonia, some of which escapes into the atmosphere, albeit for short periods of time since ammonia usually falls to ground after a few days. So detectable levels of ammonia in the atmosphere must be the result of significant ongoing agricultural activity.
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