Lost Colonies

There are tales told in folk history of the existance of 'lost colonies'. These are suitable worlds for colonisation, usually located in Quadrant Zero somewhere, that have been visited at some time in the past, but for some reason all record of their location and characteristics have been removed from astronavigational records. Theories vary as to the reasons for this. Some say it is a race of shape-changing lizards who have mind controlled everyone to forget these worlds - others that there is a widespread government conspiracy and these worlds are secret prison / mind control / experimental colonies. Most people dismiss the whole idea a plain daft. Every so often an independent trader turns up claiming to have found one of the lost colonies - but this is usually a fraud or some other scam.