Science fiction themes

Science fiction has a number of common themes that have been reused by numerous authors.

• [Alternate worlds]?
• Cyberpunk and Steampunk
• Interstellar travel
• PSY? powers
• Post-holocaust?
• Robots
• Cyborgs
• Time Travel
• [First Contact]? with Aliens
• [Alien invasion]?
• Clones?
• Colonisation?
• Dystopias and Utopias
• [Parallel World]?s
• Mutant?s
• Space opera
• Techno-thriller?s
• [Big Dumb Object]?s