system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
Do aliens exist?


assistant
Although there is no definitive evidence for the existence of extraterrestrial life, the immense number of planets that most likely exist in the universe suggest that, although the development of life can be difficult to start, there should be other life forms in the universe.  

The discrepancy between the expected existence of life in the universe and the lack of any evidence is called the Fermi-Paradox.