Aliens

Speculative fiction has always involved a meditation upon the limits of sentient beings, and the potential for unknown life throughout the universe. This section on "Aliens" showcases works of science fiction about the worlds and creatures beyond planet Earth can be categorized in terms of Invasion or Conquest. Did humans travel to other planets, or did aliens travel to Earth?

Heinlein's Stranger in a Strange Land (1961) stands as a classic of alien visitation to Earth, a device that offers the writer, like time travel, a new perspective on what humans have been trained by their society to consider normal and inevitable. Samuel Delany's Babel-17 (1966) takes seriously the infinite possibilities of linguistic communication in life-forms beyond Earth, creating a prose narrative as symbolically rich and linguistically complex as the characters communicating across the universe.