Space is so vast we cannot even get out of our own solar system easily, so it seems quite likely our galaxy may be filled with dead civilizations and we would be unaware. via unexplained-mysteries: A new study has suggested that most alien civilizations may have already destroyed themselves. Finding evidence that we are not alone in the universe has been a life-long pursuit for many astronomers, despite the task being akin to searching for a needle in a haystack. Now though, a new study written by three physicists from the California Institute of Technology ( as well as one school pupil ) has put forward the rather unfortunate conclusion that most of the intelligent alien civilizations in the Milky Way galaxy will have most likely destroyed themselves long ago. The research involved a combination of modern astronomy and statistical modelling to calculate the emergence and destruction of intelligent civilizations over time. The study has effectively produced what could be considered to