According to Srila Prabhupada, intelligent entitiies, including human beings, can travel throughout the universe through their spiritual bodies after death here on earth or elsewhere. As such, it is possible that we have human beings living here on earth who came from distant exoplanets in our galaxy or beyond in their previous lives. But he thought that human beings, in their present physical makeup cannot exist in other planets or exoplanets. Similarly, ET entities from previous physical makeup cannot exist here on earth. They have to be born through a female human being.
So, the best way to meet ETs would be through past life regression analysiis of human beings who believe that they were ETs in their previous lives. https://www.yahoo.com/tech/alien-hunting-scientist-believes-just-20-years-making-191340866.html https://www.yahoo.com/tech/alien-hunting-scientist-believes-just-20-years-making-191340866.html
