The Black Obelisk is a mysterious alien monolith that appears in Arthur C. Clarke's novel, "2001: A Space Odyssey".

Terminus is the planet where the Second Foundation is headquartered in Isaac Asimov's "Foundation" series.

Valentine Michael Smith is the Martian who is raised by humans in Robert A. Heinlein's novel, "Stranger in a Strange Land".

Gethen is the name of the planet where the Gethenians live in Ursula K. Le Guin's novel, "The Left Hand of Darkness".

The Ocean is the name of the sentient ocean that covers the planet Solaris in Stanislaw Lem's novel, "Solaris".

Ares Vallis is the name of the first human settlement on Mars in Kim Stanley Robinson's novel, "Red Mars".

Rama is the name of the alien spaceship that visits the solar system in Arthur C. Clarke's novel, "Rendezvous with Rama".

Parallel Earth is the name of the parallel universe that the characters travel to in Isaac Asimov's novel, "The Gods Themselves".

Luna City is the name of the lunar colony that rebels against Earth in Robert A. Heinlein's novel, "The Moon Is a Harsh Mistress".

Anarchres is the name of the anarchist planet that the protagonist, Shevek, comes from in Ursula K. Le Guin's novel, "The Dispossessed".

The Wanderer is the name of the alien spaceship that the crew of the spaceship Invincible encounters in Stanislaw Lem's novel, "The Invincible".

Aurora is the name of the generation ship that is sent on a centuries-long journey to Tau Ceti in Kim Stanley Robinson's novel, "Aurora".

The Monolith is the name of the alien artifact that is discovered on Jupiter's moon, Europa, in Arthur C. Clarke's novel, "2010: Odyssey Two".

The Eternity Council is the name of the organization that controls time travel in Isaac Asimov's novel, "The End of Eternity".

Kip Russell is the name of the protagonist who travels to the Moon in Robert A. Heinlein's novel, "Have Space Suit, Will Travel".