I'm not sure what to think about UFOs. I believe with out doubt that there is other life in this universe or others. Likely more advanced than us and others not. Weather of not our world has been visited, I think a few would know for certain and likely sworn to secrecy. Logically,you would think the govt would not spend the trillions on space programs just to get great views of the earth, you would imagine there is a larger plan that is not public knowledge.