Science Fiction Writing Prompts

Turns out Humans are tiny compared to any other species of aliens, allowing them to live off in the nooks and crannies of alien spaceships. Colonies can live on ships for generations unseen and unknown, or have a mutually beneficial relationship with a crew.

Humans left Earth a long time ago. In their place, dogs have evolved to be the new sentient species, but they never lost their love of humankind. Their technology has finally caught up to space travel, and they take to the stars in search of their human precursors.

FTL travel is very expensive, so humanity creates a web of hyperlanes between systems, that speed up time inside them, making travel cheaper. You enter a malfunctioning hyperlane. When you leave it, you find a galaxy with no humans, full of alien races, that see your kind as ancient precursors.

In most of the galaxy wars are often just shows of strength with fighting as a last resort. As such weapons are designed to be elaborate and flashy. Turns out humans, whose weapons are built with efficiency in mind, have a different understanding of war.

You're a Mechromancer. It's a bit like being a Necromancer, except that instead of working with dead flesh and departed souls you work with defunct machinery and deleted computer programs.

Humanity makes first contact with an alien species who are studying the life of the galaxy. When they ask to hear about our religions we offhandedly mention the church of the Flying Spaghetti Monster as a joke and they reply by saying “no, we want to know your myths not your science.”

I'm not scared of a computer passing the turing test... I'm terrified of one that intentionally fails it.

The world’s first sentient AI has fallen in love, and as magazines and female talk shows coo over the strangely romantic news, the Air Force watches nervously while their advanced nuclear response network blushes from flowers and dancing.

The galaxy is actually full of life and advanced civilizations. Everyone just leaves Earth alone because that's where The Great Old Ones are imprisoned, and nobody wants to wake them up.

Armageddon began, and it quickly became apparent that bullets beat swords and claws every single time. Now Heaven and Hell have joined in an uneasy alliance against the humans who have invaded Hell and begun using its endless fires as a power source.

A fleet of spaceships land on earth. Each filled with humans from 2.6 million years ago. They were more advanced than we ever knew, and a some fled earth to escape the coming ice age. They've travelled the galaxies, failing to find a new home. Now they're back to claim their planet...

We finally get men to Mars and discover an old Soviet flag there. The Soviets won the space race but for whatever horrifying reason didn’t say anything.

After thousands of years on a generation ship sent out to colonize the universe, nobody alive on board the ship believes in the "myth" of Planet Earth anymore. Until they receive the first transmission from Earth in hundreds of years...

Humans are reverse Kryptonians. They are weak on their home planet but strong everywhere else. No one knew this until Earth was attacked and humanity was taken off of earth to be enslaved.

The Suit is powerfull. A mech for some, body armor for others, always unique to each person who wore it. Those who wear it, hear the words "not original user, booting basic mode" As a joke, your sergeant gives you The Suit and the first thing you hear is: "User detected: Welcome back, Commander"

You are an immortal sentenced to 1000 years of imprisonment. After 200, your prison is forgotten. After 10,000 years, it is rediscovered.

Long after humans found other sentient races, aliens begin to research the history of humanity. They do not realize humans write fictional stories along with history books, and they are understandably terrified.

Every year, the Mars Curiosoty Rover sings itself happy birthday. You are a NASA technician that typically monitors its system. Today, you heard a small, quiet voice singing along with it.

The Robot Apocalypse came. Cities are empty, you stayed since you're almost out of insulin and will die soon anyway. The robots find you and while processing you one of them sees your insulin pump and asks if you want to apply for dual citizenship, since the pump technically makes you a cyborg.

There's a tiny predator in the human quarters that nobody is allowed to exterminate - under the threat of complete human riot. The humans willingly admit that yes, it DOES sometimes try to attack humans as well, but altogether, they are relaxed by the presence of the "cat".

Humanity has been eradicated. As the alien race that killed us begins to settle they're shocked to discover that old Earth myths of spirits and demons are far from fiction. The Devil, pissed off at the aliens, has decided to open the gates of Hell and let humanity get its revenge.

It's been years since the last moon landing. After several decades of silence, humans proudly set foot on it again. Up there, the astronauts found mummified human corpses inside torn open space suits. The tags were still legible, Neil Armstrong, Buzz Aldrin... the astronauts from decades ago.

A massive Imperial fleet, led by Darth Vader, suddenly appears on Earth. Vader informs the Earth's governments that he is looking for a rogue Jedi named "George Lucas." It turns out that Star Wars is real, and Lucas has been leaking information about the Empire and the Rebellion to the public.

It worked! You travelled back in time to Renaissance Age. Jokingly, you turn on your Wi-Fi, only to find a password protected network named "iɔniV ɒᗡ"

We may not be the strongest, but our immune systems are legendary among alien races. There is a saying: "if it makes a human sick it will kill you."

You've been trapped in an endlessly repeating simulation by an alien race, studied and researched. They believe when they reset it, your memory resets as well, but for the last 1000 cycles you remember everything.

You were born with an odd power that lets you know when somebody is lying. One day you're hanging out with your friend when you turn to look at him. "Why do you look at me like that? I'm not an alien", he says. He's lying.

Humans are the deadliest, and rarest, species in the known universe. Often, search parties go missing due to a singular encounter with a human ship. It has recently come to light that there is an entire planet full of them.

As the universe is dying, an immortal man is on a journey to find an immortal snail.

Aliens don't invade earth for our resources. After a civilization achieves utopia some of it's citizens get bored and fly off to other planets to enjoy primitive thrills like violence, drugs, money and fame.