Do aliens exist?
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.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: Do aliens exist?
### Input: 
### Response: 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.