Advanced alien civilizations rare or absent in the local universe
Wednesday, September 16, 2015 - 08:10
in Astronomy & Space
Sensitive new telescopes now permit astronomers to detect the waste heat that is expected to be a signature of advanced alien civilizations that can harness enormous energies on the scale of the stellar output of their own galaxy. Professor Michael Garrett (ASTRON General & Scientific Director) has used radio observations of candidate galaxies to show that such advanced civilizations are very rare or entirely absent from the local universe.