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  • Project Hail Mary: A Novel
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Project Hail Mary: A Novel Hardcover – May 4, 2021

4.7 out of 5 stars (207,747)

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#1 NEW YORK TIMES BESTSELLER • Now a major motion picture starring Ryan Gosling, directed by Phil Lord and Christopher Miller, with a screenplay by Drew Goddard

A lone astronaut must save the earth from disaster in this “propulsive” (Entertainment Weekly), cinematic thriller full of suspense, humor, and fascinating science—from the author of The Martian.

HUGO AWARD FINALIST •
NEW YORK TIMES READER PICK: 100 BEST BOOKS OF THE 21ST CENTURY • ONE OF THE YEAR’S BEST BOOKS: Parade, Newsweek, New York Public Library, Polygon, Shelf Awareness, She Reads, Kirkus Reviews, Library Journal

Ryland Grace is the sole survivor on a desperate, last-chance mission—and if he fails, humanity and the earth itself will perish.

Except that right now, he doesn’t know that. He can’t even remember his own name, let alone the nature of his assignment or how to complete it.

All he knows is that he’s been asleep for a very, very long time. And he’s just been awakened to find himself millions of miles from home, with nothing but two corpses for company.

His crewmates dead, his memories fuzzily returning, Ryland realizes that an impossible task now confronts him. Hurtling through space on this tiny ship, it’s up to him to puzzle out an impossible scientific mystery—and conquer an extinction-level threat to our species.

And with the clock ticking down and the nearest human being light-years away, he’s got to do it all alone.

Or does he?

Hailed by
USA Today as “an epic story of redemption, discovery, and cool speculative sci-fi,” Project Hail Mary is an irresistible interstellar adventure as only Andy Weir could deliver.
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From the Publisher

A lone astronaut. An impossible mission. An ally he never imagined. andy weir;the martian;scifi

“Destined to become a classic” Blake Crouch; the martian;gifts for dad;books for nerds;scifi book

“A novel that would have delighted Robert A. Heinlein and Isaac Asimov” George R. R. Martin

“Weir’s finest work to date” Brandon Sanderson;the martian;gifts for dad;books for nerds

Editorial Reviews

Amazon.com Review

An Amazon Best Book of May 2021: As Ryland Grace awakens from a coma, he doesn’t know who he is or where he is, but a mix of calculations, deductions, and slowly returning memories enlightens him: He’s a junior high school science teacher on a small space ship. His mission? Save Earth. As in The Martian, Weir makes science and problem solving not only cool but absolutely essential to survival, delivering an electrifying space adventure that yanks at both the gut and the heart strings. Readers will absorb facts about gravity and heavy metals even as Grace races against the clock and builds an unexpected partnership while hurtling through the cold depths of space. —Adrian Liang, Amazon Book Review

Review

“A crowd-pleaser on the grandest scale.”The Boston Globe

“An engaging space odyssey.”
The New York Times Book Review (Editors’ Choice)

“Dazzling.”
Vulture

“Funny, well plotted, and full of surprises.”
The Guardian

“A joy to read.”
Locus

“The ultimate page-turner.”
Daily Mail

“Weir spins a space yarn in a way only he can. Fans of his earlier works won’t be disappointed.”
Newsweek

“Andy Weir proves once again that he is a singular talent.
Project Hail Mary is so fascinating and propulsive that it’s downright addictive. From the first page as Ryland wakes up not knowing who or where he is, I was hooked.”—Taylor Jenkins Reid, New York Times bestselling author of Daisy Jones & The Six

“Reading
Project Hail Mary is like going on a field trip to outer space with the best science teacher you’ve ever had—and your class assignment is to save the world. This is one of the most original, compelling, and fun voyages I’ve ever taken.”—Ernest Cline, #1 New York Times bestselling author of Ready Player One

“Two worlds in peril, a competent (but flawed and human) man, a competent alien, unending scientific puzzles to unravel, with humanity itself at risk, this one has everything fans of old school SF (like me) love. If you like a lot of science in your science fiction, Andy Weir is the writer for you.”
—George R. R. Martin, New York Times bestselling author of A Game of Thrones

“I loved
The Martian, but I actually find Project Hail Mary to be Mr. Weir’s finest work to date. It’s somehow both exciting, yet also personal. I’m constantly amazed by how well Mr. Weir continues to write wonderfully accessible science fiction without compromising either the science or the fiction.”—Brandon Sanderson, New York Times bestselling author of the Stormlight Archive series

“Brilliantly funny and enjoyable . . . one of the most plausible science fiction books I’ve ever read.”
—Tim Peake, ESA astronaut and internationally bestselling author of Limitless

“Thrilling doesn’t even begin to describe
Project Hail Mary, which is undisputedly the best book I’ve read in a very, very long time . . . I cheered, I laughed (a lot), I cried, and when the twist arrived and the book revealed its true target, my jaw hit the floor. Mark my words: Project Hail Mary is destined to become a classic.”—Blake Crouch, New York Times bestselling author of Recursion and Dark Matter

“Readers may find themselves consuming this emotionally intense and thematically profound novel in one stay-up-all-night-until-your-eyes-bleed sitting. An unforgettable story of survival and the power of friendship—nothing short of a science fiction masterwork.”
Kirkus Reviews (starred review)

Product details

  • Publisher ‏ : ‎ Ballantine Books
  • Publication date ‏ : ‎ May 4, 2021
  • Edition ‏ : ‎ First Edition
  • Language ‏ : ‎ English
  • Print length ‏ : ‎ 496 pages
  • ISBN-10 ‏ : ‎ 0593135202
  • ISBN-13 ‏ : ‎ 978-0593135204
  • Item Weight ‏ : ‎ 1.6 pounds
  • Dimensions ‏ : ‎ 6.45 x 1.53 x 9.54 inches
  • Best Sellers Rank: #77 in Books (See Top 100 in Books)
  • Customer Reviews:
    4.7 out of 5 stars (207,747)

About the author

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Andy Weir
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ANDY WEIR built a two-decade career as a software engineer until the success of his first published novel, The Martian, allowed him to live out his dream of writing full-time.

He is a lifelong space nerd and a devoted hobbyist of such subjects as relativistic physics, orbital mechanics, and the history of manned spaceflight. He also mixes a mean cocktail.

He lives in California.

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Customer reviews

4.7 out of 5 stars
207,747 global ratings
Sponsored

Customers say

Customers find this science fiction novel engaging, with good plot twists and an ending they particularly loved. The book features well-researched science and humor that makes them laugh out loud. Customers praise the writing style, with one noting its tight prose, and they appreciate the character development and readability, with several mentioning they finished it in one sitting.
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4174 customers mention content, 3939 positive, 235 negative
Customers find the book engaging and fun to read, comparing it favorably to The Martian.
Great read, some slightly flawed logic at the end. But that said, love the redemption arc and the idea of a middle school teacher saving the world!...Read more
A great book. Action packed, suspenseful, page turning Weir writing as expected. Not quite as good as The Martian, hence the 4 stars. Poor Andy Weir....Read more
Well thought out , fun read. Thought of interfacing with another life form and having only good come of it is a lesson that we can all learn from....Read more
This was a fun and compelling read. Filled with tension, action and emotion. It will make a great movie. I'm really coming to like Andy Weir's writingRead more
2103 customers mention story, 1955 positive, 148 negative
Customers enjoy the story of the book, praising its good plot twists and ending, with one customer noting it as a gripping narrative.
Wow,! What a great story! Love how Andy writes! If you like The Martian or first contact stories this is perfect! Fun reading didn’t want to put down.Read more
This is for the audible version only. I know it's a good story for both my kids love it. But the audible version is so horrible I can't finish it....Read more
...An amazing story, characters to root for, tense moments, science, and some laughs. A book more than worthy of awards and the praise it has received.Read more
Wonderful story full of both the mind expanding ideas of space travel and alien life as well as humor and emotional connection with the characters.Read more
1118 customers mention science, 1014 positive, 104 negative
Customers appreciate the scientific content of the book, describing it as well-researched science fiction.
If you loved the Martian for the science, problem-solving, constant thought-provoking action, you’ll love Project Hall Mary. I couldn’t put it down.Read more
...Heart, tension and great science! I highly recommend this book! Parents, read this first before turning it over to your junior high kids....Read more
...It's a very enjoyable read - lots of science and solving problems mixed with some good humor and lots of heart. I was engaged the whole way through.Read more
Binged it. Amazing book. Good science and great story. It could happen just this way. Will be reading every word Andy has written.Read more
781 customers mention character development, 702 positive, 79 negative
Customers enjoy the characters in the book, with one customer specifically praising the good characterization.
...The more I read, the more I loved it. Great characters, lots of geeky science, nail biting suspense, what's not to like? I truly hated for it to end....Read more
...look so easy, with great pacing, completely believable dialogue, and characters you can't help falling in love with. Can't wait for his next novel!!Read more
Loved the detail and tension of the issues being dealt with. Character development and especially the loving relationship developed between the two...Read more
...Weir is a gift to anyone who loves interesting stories with interesting characters, intrigue, suspense, some good science nerd elements and, a...Read more
714 customers mention readability, 602 positive, 112 negative
Customers find the book highly readable, describing it as an easy fun read that can be finished in one sitting.
Weir's writing is conversational and an easy read...despite the technology he describes in minute detail. Some may be bothered by this, but not me....Read more
...Perhaps not up to the level of The Martian, but an enjoyable read with Andy’s usual mix of science with witty dialogue although this novel leaned...Read more
Well written and enjoyable, but can drag during the science parts. It is enjoyable for both people who enjoy the science aspect and people who don’t....Read more
...So far it is an amazing read and I would definitely recommend it to anyone looking for a sci fi novel that takes you beyond your regular imagination....Read more
644 customers mention humor, 616 positive, 28 negative
Customers enjoy the book's humor, finding it laugh-out-loud funny with great wit and sarcasm throughout the story.
Best sci fi book I’ve read so far! Exciting, funny, emotional, incredible imagination, wonderful relational moments, inspiring and just ‘out there’!...Read more
...Andy Weir is up to the challenge of delivering science, story, and humor in ways that keep us wanting more. So, when will we see the movie?Read more
Andy Weir has done it once again and brought his weir(d), humorous, nerdy style into a piece of fiction that keeps the pages turning at the speed of...Read more
...The protagonist is joyful, witty and so passionate about science that I didn't even realise I was learning so much, the story is just that good....Read more
534 customers mention writing style, 489 positive, 45 negative
Customers praise the writing style of the book, describing it as beautiful and well-crafted, with one customer noting its tight prose.
Well written and enjoyable, but can drag during the science parts. It is enjoyable for both people who enjoy the science aspect and people who don’t....Read more
Great writing, quick read but odd ending. Good character development. Great writing, quick read but odd ending. Good character development.Read more
...between two smart scientists from different solar systems... Very well written... Lots of scientific facts to please technical-minded boffins and...Read more
...Andy Weir is an excellent writer and a good storyteller! If you love science fiction and you’re looking for a wonderful read, this is it.Read more
411 customers mention engaging, 348 positive, 63 negative
Customers find the book engaging, with many noting they couldn't stop reading and were hooked from the first page.
Very easy reading. Got through it in 2 days. Was hard to put down.. Very entertaining with the explanations of complex science topics in a fun way...Read more
Andy Weir does it again, the same level of gripping and humorous Si-Fi tale. Imaginative, original, gripping and fun Hail Mary does it all.Read more
A great and wonderful protagonist journey! Fast read, great character's and the narrator was fabulous. I will devour what Mr. Weir writes next too!Read more
...I also learned a lot about microbiology, interstellar hazards, engineering, and music theory. It’s like Kerbal Space Program on steroids....Read more
Not gonna leave the house for a while now
5 out of 5 stars
Not gonna leave the house for a while now
Been wanting this book for months. After seeing the movie, I ordered it immediately. The hard copy makes a new addition to our library and came highly came quality. The pages feel premium and almost scared to use it how good it looks and feels
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Top reviews from the United States

  • Reviewed in the United States on March 15, 2026
    Format: AudiobookVerified Purchase
    This book was genuinely enjoyable. It blends accessible sci‑fi with enough real science to keep the world believable without slowing the pace. The author uses the scientific elements to support the story rather than overwhelm it, which makes the setting feel grounded and immersive.

    The character development is the real strength here. The protagonist doesn’t stay static — you see clear growth, better decision‑making, and emotional evolution as the story progresses. That arc gives the plot more weight and makes the challenges feel earned rather than convenient.

    Overall, it’s a satisfying mix of science, story, and character work. A solid read for anyone who likes sci‑fi that respects both imagination and realism.
    18 people found this helpful
    Report
  • Reviewed in the United States on March 27, 2026
    Format: PaperbackVerified Purchase
    Andy Weir’s latest novel continues a theme of blending scientific knowledge to solve problems and the perils of outer space exploration. In this tale, a middle-school science teacher, Ryland Grace, is faced with a seemingly insurmountable task, saving earth from a cooling sun. Long before he became a science teacher, he wrote a paper about the possibility of the existence of life forms that don’t need water to survive. At the time, his analysis was widely rejected and ridiculed. Now, because it appears that life forms are responsible for draining the sun, he has become a visionary and is tasked with working with a group of international scientists to find a solution for a what could be a global catastrophe.
    Through scientific experiments, Grace and his team determine that the microscopic organisms he calls “astrophages” are a threat to humankind and must be stopped. But how? After a series of tragedies and misadventures, Grace wakes up years later in a space-craft. His memory slowly returns as he has been placed in an induced coma with robots and computers tending his biological functions. The most incredible and fantastic event occurs when he meets another being with the same objective he has.
    The story goes back and forth in time showing how Grace ended up in the space-craft and his current dilemma of finding a way of counteracting the astrophages. The novel incorporates a wealth of scientific knowledge along with generously placed doses of humor. This is a book that will appeal to a wide readership, from teens interested in science, to adults intrigued by sci-fi and adventure. It’s a satisfying and enjoyable read and creates a feeling of wonder.
    8 people found this helpful
    Report
  • Reviewed in the United States on March 30, 2026
    Format: HardcoverVerified Purchase
    Amazing audiobook. The narrator brings the story to life and makes it enjoyable. I love the storyline, the characters, the friendships. It is well written and overall fast paced. On the bad side, it was too heavy on the science. Most parts science related, I just wanted to skip them. But whenever I was given two characters talking about the project and how they would do it and overcome barriers, and I ate it up!
  • Reviewed in the United States on May 10, 2021
    Format: HardcoverVerified Purchase
    According to a 2003 article on the NASA website, "NASA-funded scientists have recently learned that cloud-to-ground lightning frequently strikes the ground in two or more places ..." and that the third and fourth strokes of a lightning flash will follow the same path as the second stroke. In other words, lightning DOES strike the same place twice.

    But you don't need to search the web for this information. If you want proof that lightning strikes twice, just read Andy Weir's newest book, Project Hail Mary, and you'll see that Weir has created a giant sci-fi bestseller, in the same electric path as The Martian.

    Ryland Grace has a puzzle on his hands. He wakes up without a clue as to where he is, but he seems to be alone except for a computer AI that was keeping him alive. Unfortunately it didn't seem to be doing the same for two others in his ... wherever he is ... as he notes the decayed corpses in their creches on the ... well, it's a ship. A space ship. And bit by bit Grace puts the pieces of the puzzle together.

    An alien microbe has been discovered. Ryland Grace is brought on to the science team to learn more about the life form because Grace, currently a middle school science teacher, wrote papers about the notation that there does not need to be water to create life. Only in a biozone such as Earth's would water be needed, but other building blocks could be used in other systems.

    The science community as a whole mocked Grace, which is why he left and went on to teach kids, but now, he may be the best suited to understand this new life form. And as he remembers more and more, he also remembers that this life form is feeding on the energy output of the sun, which is decreasing the energy that gets to Earth, which spells disaster - as in the end of all life as currently known - on Earth if something isn't done.

    Scientists discover that Sol isn't the only star that is losing its energy output - likely due to the alien consumption, but that there is one star, in the center of all the known stars losing their energy, that remains constant with its output. In which case, the answer to the survival for Earth is likely found there, at Tau Ceti.

    The world's best scientific minds come together (by force and coercion) to create a ship that can get to Tau Ceti in twelve years (using the alien microbe as fuel) with shuttle pods to bring back answers to how to save the planet, but for the crew, it's a one-way trip.

    Knowing why he's there is only the first puzzle for Grace. Now he has to figure out how to save Earth. There's a very small window of time for him to discover the way to save the human race and get the answers sent back. Take too long and the shuttles will return to a dead planet.

    This book is amazing.

    Author Andy Weir brings us back to the magic that made The Martian so successful - an abandoned scientist trying to survive. But Ryland Grace's story is more complicated because he's not just trying to survive, but also help humanity survive.

    There's lots and lots of science - which is part of Weir's writing signature - and there's also a really wonderful story.

    It's hard for me to tell you just what I liked about this book because anything I write will be a spoiler and a huge part of the joy in this book is making the discoveries with Ryland Grace.

    Grace is our main character, but through the liberal use of flashbacks, we have a full cast of characters - at least one quite important to the story. Everyone is unique and individual which makes it easy to read, but just as with The Martian, where Mark Watney's personality carries the story, Ryland Grace here is the smart-mouth, sometimes funny, obsessed scientist infusing his personal tastes into his discoveries. He's also quite smart - which is good since he will need his intellect to save all of humanity.

    This is a page-turner. I did not want to put this book down. Neither did my 21 year old son who picked up my copy after I was well into it and finished it before I did. And days later he's still talking about how much he liked it and quoting sections of it to me at the dinner table.

    I hope Ballantine Books will do a very large print run because this is going to be huge seller and you definitely don't want to miss out on the biggest thing to come out in 2021.

    Looking for a good book? Project Hail Mary by Andy Weir is proof that lightning strikes twice as this has all the excitement and energy of Weir's debut novel, with a more complicated storyline that will hold the reader all the way to the end.
    135 people found this helpful
    Report

Top reviews from other countries

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  • Siddh Pandya
    5.0 out of 5 stars "An Epic Sci-Fi Adventure with Heart, Humor, and Brilliance"
    Reviewed in India on July 2, 2025
    Project Hail Mary is one of the most gripping, emotionally satisfying, and cleverly written sci-fi novels I’ve ever read. From the very first page, I was hooked by the mystery and momentum—and it never let go.

    The story blends science, survival, and humor with perfection. The pacing is spot-on: never slow, never rushed. Just like The Martian, Andy Weir’s signature wit shines through, but here he adds a surprising amount of heart and emotional depth—especially in the bond between the characters.

    The climax is absolutely epic, and the conclusion left me stunned in the best way. It’s not just a great sci-fi story—it’s a celebration of friendship, sacrifice, and problem-solving at the edge of the universe.

    If you want a book that makes you laugh, think, and maybe even tear up a little—this is it. A modern sci-fi classic.
    Customer image
    Siddh Pandya
    5.0 out of 5 stars
    "An Epic Sci-Fi Adventure with Heart, Humor, and Brilliance"

    Reviewed in India on July 2, 2025
    Project Hail Mary is one of the most gripping, emotionally satisfying, and cleverly written sci-fi novels I’ve ever read. From the very first page, I was hooked by the mystery and momentum—and it never let go.

    The story blends science, survival, and humor with perfection. The pacing is spot-on: never slow, never rushed. Just like The Martian, Andy Weir’s signature wit shines through, but here he adds a surprising amount of heart and emotional depth—especially in the bond between the characters.

    The climax is absolutely epic, and the conclusion left me stunned in the best way. It’s not just a great sci-fi story—it’s a celebration of friendship, sacrifice, and problem-solving at the edge of the universe.

    If you want a book that makes you laugh, think, and maybe even tear up a little—this is it. A modern sci-fi classic.
    Images in this review
    Customer image
  • James Small
    5.0 out of 5 stars Very enjoyable
    Reviewed in the United Kingdom on January 21, 2026
    I'm not a big fiction reader tending mainly to stick to non-fiction science, history, biographies etc but enjoyed The Martian so thought I'd give Project Hail Mary a go and am thoroughly pleased I did. The story is interesting and well-written and I enjoyed the past / present way of telling the story. The science is well-researched and plausible and the inter-play between the characters very enjoyable.
  • Erik Nieuwenhuis
    5.0 out of 5 stars So absolutely wonderful!!!
    Reviewed in the Netherlands on January 21, 2026
    I am a little speechless. What a beautiful book. I read it in a frenzy. Thank you Andy Weir!!!
    Erik
  • Nyanko
    5.0 out of 5 stars 原作と映画で二度面白い
    Reviewed in Japan on April 1, 2026
    Format: KindleVerified Purchase
    以前audibleで聴いてすっごく面白かったので映画を観に行きました。
    映画は結構端折ってあったり、上手く設定をいじっていて似て非なるものでしたがとても良くできたSF映画でした!面白くて2回観ました!
    また読みたくなったので今度はkindleで購入しました。
    やっぱり面白い!
    翻訳本もいずれ読みたいなと思いました。
    Report
  • Paul@Aude_France
    5.0 out of 5 stars Sci-fi masterpiece
    Reviewed in France on June 15, 2025
    Format: PaperbackVerified Purchase
    I absolutely adored PHM. It has everything: adventure, humanity, encounters with alien life forms, suspense, science, and, yes, emotion. I was in awe of the book. What a story. A rather ordinary science teacher is sent to a distant star to save planet Earth and meets an alien, Rocky, who is trying to save his own planet. A beautiful friendship blossoms between the teacher and the alien. It's such a beautiful story.
    Not a scientific person myself, I wasn't in the least put off by the science in the book. In fact, it's wondrous.
    This will stay with me for a long time. A truc sci-fi masterpiece and a great story, whether you like the genre or not.