Why are there no tourists from other worlds?
Altro interessante meeting SETI sul tema "quasi UFO":
28/11/2011 The Fermi Paradox: Why are there no tourist from other worlds?
11/7/2017 When will we find the aliens?
28/7/2016 Why aren't Aliens already here?
28/11/2011 The Fermi Paradox: Why are there no tourist from other worlds?
11/7/2017 When will we find the aliens?
28/7/2016 Why aren't Aliens already here?