Project Hail Mary Book Quiz

1. How does the novel reveal Ryland Grace's past? — In flashbacks that surface as his mission-start amnesia wears off. Grace wakes with his memory chemically blanked; chapter by chapter the coma-drug fog lifts and the reader assembles who he is, how he was drafted, and what the mission costs - the book's whole mystery engine.
2. What is astrophage? — A microbe that feeds on the sun's energy and is dimming it, star by star. Astrophage migrates between Venus and the sun, eating energy and bleeding it off as infrared at the 'Petrova frequency' - and Earth's sun is next on the menu, with about thirty years of light left.
3. What is the Petrova line? — A faint beam of infrared light between Venus and the sun - the astrophage migration route made visible. The thin line of light was the first hard evidence: something is farming the sun. Every star in the neighborhood is going dark, and the pattern says Earth's has a countdown.
4. Who - and what - is Rocky? — An engineer from the planet Erid, spider-shaped, who sees with sound and speaks in musical chimes. Rocky's species evolved in a 29-atmosphere helium world at ten times Earth gravity; he hears the world and sings it back. He is stranded in the same system for the same reason as Grace - his home star is dying too.
5. How do Grace and Rocky learn to talk to each other? — Grace writes software that maps Rocky's chord-language to English word by word, over months of shared work. Rocky appends a chime meaning 'question' to every question and never gets idioms; the comedy and the trust both come from the translation grind - two engineers inventing a shared language one mistranslation at a time.
6. What is taumoeba? — A Venusian microbe that eats astrophage - the candidate weapon, if it can be taught to survive new environments. Earth's own upper atmosphere holds a predator that devours astrophage; the second half of the book is breeding it hardier - the nitrogen-tolerance problem is the final boss.
7. What happened to the Hail Mary's other two crew members? — They died when their chemically induced comas failed during the four-year voyage. Commander Yao and Ilyukhina never woke up. Grace - the science teacher who never wanted to be there - is the last chance two species have, which is the joke and the tragedy the amnesia has been holding back.
8. What does Grace choose at the end? — He gives up his ride home - sending Earth the cure unmanned while he goes with Rocky to Erid. There is no fuel and no mass for both a return and a rescue, and Rocky will not survive the trip home: Grace, who began the book refusing the mission, ends it as the first human immigrant to another civilization - teaching Eridian children physics.

Eight multiple-choice questions covering Andy Weir's plot, characters and most famous moments. The quiz takes about two minutes and your score is instant.

Yes — no signup, no email, nothing to install. Answer the eight questions and get your score immediately.

8/8 means you know the book cold; 6+ is a solid score. Below 4, the book is calling you back for a reread.

Moderate - the prose is easy and funny, but the plot runs on real science (orbital mechanics, relativity, nitrogen metabolism) explained as it goes. Readers who liked physics class will devour it; readers who don't can skim the equations and still cry at the end. The questions themselves stick to famous, load-bearing moments — the scenes and lines the book is remembered for — so a genuine read usually scores 6+.

About 124,000 words — roughly 496 pages, or about 8 hours and 41 minutes at an average pace. The full pace breakdown is in how long it takes to read Project Hail Mary.