What are your theories on UFOs?

I'm curious to know your opinions, granted not all sightngs are caused by the same phenomeonen, but personally....


What do you think UFOs are?

I don't think one theory can explain every UFO sighting or 'Alien' race. What's true for one may be false for another. Some may have utilized interstellar travel, some dimensional travel, some may be here already under the sea or from deep in the ground. Then I guess there's the question of time travelers, (given it's even scientifically possible). Lastly some of the 'UFOs' may be organic creatures that have adapted to life in space. Perhaps they have incredibly long life cycles that make distant space travel viable or are made entirely out of energy.

It's only theory and it's all up for debate I guess. Anything's possible!