One of the most frequently portrayed alien races from our own solar system are the Martians, Mars being the most romanticized of the other planets whose surface conditions are closest to being amenable to life. See Mars in fiction for more details on the red planet's numerous roles.
Popular fictional tales of the first half of the 20th century also includes many fanciful tales of alien races and civilizations on our nearest neighbor, the Moon.
Many of the aliens have been hostile and alien invasion has been a very popular idea in Anglo-Saxon science fiction.
Writers have created a long list of extraterrestrial creatures and intelligent beings. Most common forms of aliens are:
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Aliens that have either disappeared and left only ruins or developed to godlike- practically omnipotent entities.
wikipedia.org dumped 2003-03-17 with terodump