Are UFOs strangers

Some times i think that maybe UFOs carry some creatures that are same with us. They are just coming from future. Who knows?Maybe men have invented a vehicle that can carry them into the time also time and space are a connected issues. Some scientists and astronomers believe that dark holes and white holes are doors to future or past.Considering this theory human cantravel in time. So If human in future will produce it maybe they are watching us in our time. What do you think?