Aliens are a term used to refer to creatures or entities that are not human and originate from planets other than Earth. Descriptions of the shape, size, and personality of aliens are often diverse and varied, depending on the author or scientist using imagination or scientific data to imagine or construct. However, in all those descriptions, aliens are often described with special characteristics such as mutation, rapid development, the ability to control and interact with environments completely different from humans, and may have significant differences in adaptation and survival in different conditions of the universe.
