... From even a few light hours away a Dyson sphere would be almost impossible to see in visible wavelengths unless it was silhouetted by a dense starfield. (image credit: original image of Milky Way by ESO, altered by Colin Johnston/Armagh Planetarium) . ... We now know that there have been planetary systems around some stars since 11 billion years ago , plenty of time you would think for intelligence to arise and reengineer its local planets into Dyson spheres in numerous systems across the Galaxy. ...