Conspiracy theorists believe there’s truth about UFOs and extraterrestrial life that has been hidden from the public. Aerial observations involving alleged UFOs and alien life have been reported for many decades. Some can be attributed to astronomical phenomena, such as bright meteors, comets, or the five planets that are visible to the naked eye. Others can also be explained as Parhelia and Lenticular clouds.
Scientists Carl Sagan and Stephen Hawking agree that it would be impossible for life not to exist outside planet Earth. The Copernican principle states that Earth does not occupy a unique position in the Universe. Mediocrity principle additionally states that there’s nothing special about life on Earth.
Scientists believe life may have started shortly after the Big Bang more than 13.8 billion years ago when the Universe was only 10-17 million years old. It is scientifically accepted that life may have emerged independently in many places of the Universe. Scientists also theorize that life was spread via asteroids, meteoroids, and other small solar system bodies.
Scientists have promoted the idea of “habitable zones” since the 1950s. The habitable zones are places where life likely exists. The search for these habitable zones leads to the discovery of Earth-like planets. On November 4, 2013, astronomers revealed that there could be as many as 40 billion Earth-sized planets that exist in the Universe. The data was gathered through the Kepler space mission. Astronomers estimated that among the Earth-sized planets that exist, 11 billion of them might be orbiting Sun-like stars. According to scientists, the nearest of such planet may be 12 light years away.