The aliens may have found their grave. As we sweep the radio frequencies, we hear only noise; as we slew our telescopes, we see barren pixel after pixel. Is that because our fellow inhabitants of the galaxy have done themselves in, reducing their home planets to cinders? Is the night sky a charnel house hidden under a veil of tranquility?
http://cosmos.nautil.us/short/86/maybe-we-havent-seen-any-aliens-because-theyre-all-dead
