Why won't the blighters land?
The apparent size and age of the universe suggest that many technologically advanced extraterrestrial civilisations ought to exist. However, this hypothesis seems inconsistent with the lack of observational evidence to support it. The Fermi Paradox Why haven't we come across any aliens yet? I'm talking about convincing scientific proof, not garbled " ...them thar moon-critturs been done abducted me ag'in ..." reports from the likes of Cletus Hickson in Bumfuck, Arkansas . It feels right that aliens should exist. Surely by now we should have come across some hard evidence? A belief in aliens is older than our knowledge of the wider universe. Even before we had any idea that there existed worlds other than our own we had a concept of non-human intelligent beings. These concepts were quite distinct from our ideas of other humans. Even if Thugg the Caveman had taken a gap year before going to The University of Central Ugland and had trekked across Europe and down i...