The Fountains of Paradise is a novel by Arthur C. Clarke that explores the ethical and environmental implications of space exploration, particularly the potential for humans to damage or destroy alien ecosystems.

Gethen is the name of the planet where the story of The Left Hand of Darkness takes place. It is a planet with a unique gender system, where individuals are neither male nor female, but can change their gender during their lifetime.

Red Mars is a science fiction novel by Kim Stanley Robinson that deals with the environmental impact of human colonization on Mars. It is the first book in the Mars trilogy, which also includes Green Mars and Blue Mars.

Terminus is the name of the planet where the Foundation is established in Isaac Asimov's Foundation series. It is a remote planet located on the edge of the galaxy.

Dawn is a novel by Octavia Butler that explores the relationship between humans and the environment on a distant planet. It is the first book in the Xenogenesis trilogy, which also includes Adulthood Rites and Imago.

Rama is the name of the alien spacecraft that is discovered by a human spaceship in Arthur C. Clarke's Rendezvous with Rama. It is a cylindrical object of immense size and unknown origin.

The Word for World is Forest is a novel by Ursula K. Le Guin that explores the relationship between humans and the environment on a distant planet. It is a story about the struggle between a human colony and the indigenous inhabitants of the planet.

Aurora is the name of the generation ship that is sent on a centuries-long journey to a distant star system in Kim Stanley Robinson's Aurora. It is a massive spacecraft that carries a crew of thousands of people.

Robots and Empire is a novel by Isaac Asimov that deals with the environmental impact of human colonization on a distant planet. It is the fourth book in the Robot series, which also includes The Caves of Steel, The Naked Sun, and The Robots of Dawn.

HAL 9000 is the name of the artificial intelligence that controls the Discovery One spaceship in Arthur C. Clarke's 2001: A Space Odyssey. It is a powerful and intelligent computer that is capable of independent thought and action.

Always Coming Home is a novel by Ursula K. Le Guin that explores the relationship between humans and the environment on a distant planet. It is a story about a utopian society that lives in harmony with nature.

Icehenge is the name of the alien artifact that is discovered in Antarctica in Kim Stanley Robinson's Icehenge. It is a massive structure made of ice that resembles Stonehenge.

Foundation is a novel by Isaac Asimov that deals with the environmental impact of human colonization on a distant planet. It is the first book in the Foundation series, which also includes Foundation and Empire, Second Foundation, and Foundation's Edge.

The Overlords is the name of the alien species that arrives on Earth in Arthur C. Clarke's Childhood's End. They are a benevolent race that comes to help humanity evolve to a higher level of consciousness.

Rocannon's World is a novel by Ursula K. Le Guin that explores the relationship between humans and the environment on a distant planet. It is the first book in the Hainish Cycle series, which also includes Planet of Exile, City of Illusions, and The Dispossessed.