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.
Advanced civilizations harnessing energies on galactic scales (so-called Kardashev Type III civilizations) are expected to be detectable in the mid-Infrared part of the spectrum via the emission of significant waste heat products. A team of astronomers led by Dr. Jason Wright (Penn State University, USA) has already drawn up a list of several hundred candidate galaxies (culled from a total population of 100,000 objects) where unusually extreme mid-IR emission is observed. One problem is that although rare, this kind of emission can also be generated by natural astrophysical processes related to thermal emission from warm dust.
The Kardashev Scale is not the be all end all definition of advanced civilizations, IMO. It extrapolates from known terrestrial physics, ignoring the possibility of hitherto unknown, exotic new physics. We have voluminous evidence of advanced technology visiting Earth. The silence on the part of mainstream academia regarding this fact is highly suspicious, at best. Where this technology originates from is anyone's guess, or, is it? Just because our technology has not detected evidence in our local, physical universe, doesn't preclude an advanced technology from a different universe visiting this one. But even that's an unnecessary stretch. I think we are being institutionally lied to in the biggest cover up in human history. The question is, why? To read more, click here.