Professor Simon Conway Morris, a paleontologist at the University of Cambridge, the United Kingdom, says that aliens do exist and they look like us (human beings). He argues that alien life would become inevitably intelligent and may as well follow a theory known as convergent evolution.
This suggests species will independently evolve similar traits and features to solve particular problems presented to them by their environment. He uses the eye as an example, which is thought to have evolved independently more than 50 times in the history of the earth.