In pursuit of the theory that the solar system is a ‘smoking gun’, Gary Gilligan has written two previous books: An Ancient World in Chaos and Comet Venus (both Matador, 2008 and 2...view moreIn pursuit of the theory that the solar system is a ‘smoking gun’, Gary Gilligan has written two previous books: An Ancient World in Chaos and Comet Venus (both Matador, 2008 and 2010). Extraterrestrial Sands is the third book in the series and is centred on geological evidence.view less