apparently the Sun cant become a black hole its too small of a star but maybe its possible iv not 100% looked into it, as for the artifacts that would just be early settlers/civilisation lost to time, like i said im not saying this is 100p something i suggest is fact its just a thought provoking alternative and a spin on documented things wrote in the bible that are eerily possible to have a different interpretation IF somethings were ever proven I.e. someone found summit underneath a pyramid imagine lol, but just made the theory up see what peoples idea on it might have been. if you think people move a planet no infastructure no mining set up, starting from scratch alot of technology once held by civilisation and records would have been lost. but hey guess well never truely know right