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
Concept

Hail Mary Rescue Mission

A last-ditch, near-suicide interstellar mission by global scientists to find a cure for Astrophage before the entire human race goes extinct in 30 years.

SurvivalSci-FiSpace Mission
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

Tau Ceti E Biosphere Found

Grace and Grace discover Tau Ceti e has a complete, thriving biosphere, which is the exact reason that Astrophage never ate the Tau Ceti star.

Sci-FiDiscoveryExoplanet
Concept

Astrophage Alien Parasite

A mysterious non-water-based alien life form that feeds on stellar energy, spreads across star systems, and makes host stars dim exponentially at a rapid pace.

Sci-FiAlien LifeStellar Physics
Concept

Tau Ceti Ceti Predator

A tiny amoeba-like organism native to Tau Ceti e, which feeds exclusively on Astrophage and keeps the Tau Ceti star system safe from infection.

Sci-FiAlien LifePredator
Insight

Collective Sacrifice Saves Civilization

The selfless sacrifice of ordinary people, not just legendary heroes, is the core reason that human civilization survived the Astrophage apocalypse.

SurvivalHumanitySacrifice
Golden Sentence

Small Discovery Saves World

The tiny, overlooked fact that Astrophage stores energy via neutrinos became the key to building perfect radiation-proof spaceship hulls for interstellar travel.

InnovationSci-FiDiscovery
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

Astrophage Reproduction Discovery

Grace accidentally finds a 4th Astrophage sample in his sealed dark lab, and realizes the alien life can reproduce infinitely under the right conditions.

Sci-FiAlien LifeDiscovery
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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