Given the fact that there are hundreds of billions of galaxies (each with hundreds of millions of stars), no doubt aliens exist somewhere. However given the laws of physics its a virtual certainty that no biological alien has ever visited the earth. However over the past twenty years earth has been transmiting an endless stream of digital alogromithic data. An electronic response may be soon be coming. There may be in fact a string of civilizations linked in this manner.
Are you assuming we know all there is to know about physics?
“However given the laws of physics its a virtual certainty that no biological alien has ever visited the earth ...” Well that answers my immediate question regarding how idiotic a statement ... and the poster doesn’t even comprehend how stupid the assertion is that we know ALL the laws of Physics. In fact, we are discovering that we poorly comporehend the laws we’ve discovered! Even Maxwell’s equations ahd solutions which call into question the Einstein theory of general relativity being the end all of Physics laws!