Project Hail Mary
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Project Hail Mary

Andy Weir

4.1496 learners

Dr. Ryan Grace wakes up adrift in deep space, amnesiac and surrounded by the corpses of his crew, with no clue how he got there. As his memories slowly return, he learns he’s aboard the *Project Hail Mary*—a suicide mission to save Earth from Astrophage, an alien organism draining the sun’s energy. When he discovers Rocky, a fellow alien survivor from a star system facing the same crisis, the pair form an unlikely bond. Together, they race against time to uncover Astrophage’s natural predator, navigate deadly space hazards, and confront unexpected twists like evolved Tau Worms that threaten their mission. In the end, Grace faces an impossible choice: return to Earth as a hero or sacrifice his chance to save his only friend. This witty, heart-pounding sci-fi adventure blends hard science with heartfelt friendship, proving connection is the greatest force even in the vast void.

AstrophageTau WormRyan GraceRockyProject Hail Mary
Scenario

10km Chain Sampling Mission

Grace and Rocky make a 10km long xenonite chain, drag it down to Tau Ceti e's lower atmosphere to collect samples and find Astrophage's natural predator.

ExperimentSci-FiAdventure
Scenario

Grace Settles On Erid

After saving both Earth and Erid, Grace chooses to stay on Erid long term, and lives with his best friend Rocky for the rest of his life.

Sci-FiNew HomeEnding Scene
Golden Sentence

I Will Not Leave My Friend

Grace chose to give up his guaranteed hero return to Earth, risking starvation to go back and rescue his alien friend Rocky when he was stranded in empty space.

friendshipCourageSci-Fi
Scenario

First Contact With Rocky

Grace spots a weird alien spaceship near his craft in Tau Ceti system, and sends a 3-short-1-long engine signal to test if intelligent life is on board.

First ContactSci-FiAlien
Scenario

Grace Rescues Stranded Rocky

Grace spends weeks scanning 4 million km of empty space, and finally finds Rocky's fuel-empty ship drifting alone in the dark after all Astrophage got eaten.

friendshipSci-FiRescue
Scenario

Rocky's Crew Dies From Radiation

All 23 of Rocky's crewmates die of unknown radiation sickness mid-voyage, and only Rocky survives because he stayed near radiation-blocking Astrophage fuel.

TragedySci-FiAlien
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