Trantor is the capital planet of the Galactic Empire in Isaac Asimov's 'Foundation' series, known for its immense population and technological advancements.

HAL 9000 is the advanced artificial intelligence system that controls the Discovery One spacecraft in Arthur C. Clarke's '2001: A Space Odyssey'.

Gethen is the planet in Ursula K. Le Guin's 'The Left Hand of Darkness' where the inhabitants, known as the Gethenians, are ambisexual and undergo periodic gender changes.

Guy Montag is the protagonist of Ray Bradbury's 'Fahrenheit 451', a fireman who is assigned to burn books in a dystopian society where literature is prohibited.

In Douglas Adams' 'The Hitchhiker's Guide to the Galaxy', the answer to the 'Ultimate Question of Life, the Universe, and Everything' is revealed to be '42'.

Valentine Michael Smith is the Martian protagonist of Robert A. Heinlein's 'Stranger in a Strange Land', who is raised by humans and faces challenges in adapting to Earth's culture and norms.

Lauren Olamina is the protagonist of Octavia E. Butler's 'Parable of the Sower', a young woman who leads a community in a post-apocalyptic world characterized by environmental degradation and social unrest.

Ares Vallis is the site of the first human settlement on Mars in Kim Stanley Robinson's 'Red Mars', chosen for its relatively hospitable conditions and potential for water resources.

Rama is the name of the enigmatic alien spacecraft that enters the solar system in Arthur C. Clarke's 'Rendezvous with Rama', captivating scientists and astronomers with its unique design and unknown purpose.

Solaris is the name of the sentient ocean that covers the planet Solaris in Stanislaw Lem's novel of the same name. It possesses consciousness and communicates with the human crew through various phenomena.

Neutron Star is the name of the parallel universe that the characters discover and interact with in Isaac Asimov's 'The Gods Themselves'. It is a universe where neutrons are stable and form the basis of life.

Anarchres is the name of the anarchist planet where the protagonist, Shevek, comes from in Ursula K. Le Guin's 'The Dispossessed'. It is a society based on the principles of freedom, equality, and cooperation.

Overlords is the name of the alien species that arrives on Earth and brings about profound changes to humanity in Arthur C. Clarke's 'Childhood's End'. They possess advanced technology and knowledge that reshape human society.

Green Bluff is the name of the first human settlement on Mars in Ray Bradbury's 'The Martian Chronicles'. It faces numerous challenges, including harsh environmental conditions, conflicts with indigenous Martian life forms, and internal social issues.

Aurora is the name of the generation ship that embarks on a centuries-long journey to a distant star system in Kim Stanley Robinson's 'Aurora'. It carries a diverse crew and faces numerous challenges along the way.