SHARES Last month, the US Department of Defence released what information they had on Unidentified Aerial Phenomenon (UAPs) – more commonly known as UFOs. While most (all) of the 144 sightings are the result of experiment defence technology – there is a long history of that, what is the likelihood aliens could visit us? Many astronomers, astrobiologists, and astrophysicists would agree that some sort of life somewhere exists. However, life does not always mean humans or intelligent creatures. Plants, trees, dogs, animals, and even bacteria all share this planet with us. And that is just current life on Earth. Earth has been around for 4.6 billion years, and life emerged about a billion years later. There has been lots of life on Earth, more than humans.