No Obvious Signs of Advanced ET Societies in 100,000 Galaxies: Penn State Study (2015 April 21):

• by johnfairweather

  http://spacewatchtower.blogspot.co.uk/2015/04/no-obvious-signs-of-advanced-et.html

  Posted May 7, 2015 1:27 PM

• by shunter_1999

  how were they discovered

  Posted August 28, 2015 4:01 PM