Planets that look alike could be an indication of spacefaring aliens

Close by planets that look unusually alike could possibly be an indication of spacefaring alien life that has travelled between stars, researchers have urged.

Astronomers trying to find extraterrestrial life are likely to search for particular alerts, both within the type of “biosignatures” – molecules which can be solely produced by organic processes – or “technosignatures”, irregular patterns of sunshine which will have been produced by applied sciences.

Each of those depend on assumptions…