My theory is that we are not alone - at some point throughout the existence of the universe, there has been, is, or will be some form of life on another planet

My theory is that we are not alone - at some point throughout the existence of the universe, there has been, is, or will be some form of life on another planet - close to ours or far away from outs. There probably is some new physics that we don't understand yet. My guess is that it's a matter of chemistry - there's probably a whole bunch of elements that don't exist here on earth, and we don't know what can be done with them. Maybe our visitors do, and that's why they are here, or maybe for some other reason. We'll likely never know the answer.