The United States government's recent release of hundreds of previously classified Unidentified Anomalous Phenomena (UAPs) cases spanning the 1940s to the present, along with the new Steven Spielberg movie , Disclosure Day, about extraterrestrial life, has fuelled the idea that aliens are visiting Earth. In fact, polls in Australia , the US and elsewhere indicate around a third of the public believes aliens are here. However, while what we know about the universe suggests aliens may exist,