via:Unexplained-Mysteries A new study has suggested that we may be able to pick up the telltale signs of this process from light years away. The idea of looking for signs of intelligent extraterrestrial civilizations by trying to find evidence of their technology - so-called 'technosignatures' - has been explored several times over the years. Some scientists have speculated that we might be able to see huge alien megastructures in space - objects of such potentially enormous scale that they can be observed with a telescope. The Dyson Sphere - a theoretical structure built to encompass an entire star - is one such possibility, but now scientists have come up with another possible indicator of extraterrestrial technology that we might be able to detect from Earth and it is all to do with harnessing energy from black holes. According to the study's authors, technology capable of doing this may leave traces just outside the black hole's event horizon that we could see from Earth - that is