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 extra-terrestrial life, has fuelled the idea that aliens are visiting Earth.

In fact, polls in Australia, the US, and elsewhere indicate that around a third of the public believes that aliens are here.

However, while what we know about the universe suggests that aliens may exist, there are three compelling reasons why they probably aren’t visiting us.