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Project Hail Mary by Andy Weir
Genre: Science Fiction
Pages: 476
Rating: ★★★★☆
Buy: Bookshop.org
This post contains spoilers.
Book Blurb
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 realises 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?
My Thoughts
Project Hail Mary by Andy Weir is one of those books that sneaks up on you. I’ll admit, at first I wasn’t fully sold. Ryland Grace’s inner monologue felt a little grating, almost too much in its attempt to balance humor with high-stakes science. It took me a bit to settle into his voice. Also, some of his science monologues at the beginning made my eyes glaze over, although you can definitely skim those sections without losing anything major in the book.
But then Rocky shows up, and everything changes.
Around the 30% mark, the story completely transforms into something deeper, more engaging, and honestly, more emotional than I expected. The dynamic between Grace and Rocky is the heart of this book. Their partnership doesn’t just make the story better, it is the story. Neither of them would have succeeded alone, and that mutual dependence adds a layer of meaning that goes beyond the science.
That said, there were definitely moments that pulled me out of the story.
The biggest one is the ethics (or lack thereof) behind Grace’s mission. The fact that he was forced into a coma and sent into space against his will is pretty disturbing. Add to that the tragedy of his crewmates dying before the mission even really begins, and it casts a much darker tone over the story than the humor might suggest. However, it does make sense for the story that him going to space is the only logical decision at that point, so whether he wanted to or not, he was going to be put on the mission. I just wish he had decided for himself, but the fact he thought he had a real choice in the matter was a heart wrenching moment.
Some of the logistical and scientific decisions also felt questionable. For example, the nitrogen situation on the ship—originally intended for Dubois’s death—didn’t fully add up once Dubois was no longer on the mission. I get that the launch was only days away, but I don’t really understand why they would’ve kept all that nitrogen on the ship for the mission once Dubois died. Wouldn’t they have just jettisoned it into space to save weight?
Similarly, the idea that the main scientist and backup scientist were allowed to be in a romantic relationship (and even work closely together in high-risk scenarios) felt wildly unrealistic given the stakes. When you’re dealing with something as dangerous as astrophage—essentially nukes x100—you’d think protocols would be airtight.
There were also a few worldbuilding and technical elements that made me pause. First, the Hail Mary being able to maintain Rocky’s atmosphere of 29x gravity seemed a little unrealistic. Since he moves into the ship and takes over a third of the space with his atmosphere, I was surprised there were no major consequences to the Hail Mary. I would think that could be catastrophic.
Another thing is at the end of the book, Grace is living on Rocky’s planet in an enclosure made just for him, but they couldn’t adjust the gravity for the enclosure. You’d think from all the things we see Rocky do during the book, his people would be able to adjust the gravity for Grace so he’s not being bombarded by 29x Earth’s gravity. I felt it was highly unrealistic that they make him live like that.
But interestingly, a lot of these issues faded into the background once Rocky became a central presence. He brings balance, not just emotionally, but narratively. The story becomes less about dense calculations and more about connection, survival, and trust.
One thing I kept thinking about throughout the book: what’s happening back on Earth? Grace is gone for over 26 years. That’s an entire lifetime of change, decline, or possibly even collapse. It’s hard not to wonder whether there’s anything left to save by the time his mission ends, and that lingering question adds an almost haunting undertone to the story.
Final Thoughts
Project Hail Mary is ultimately a story about connection in the most unexpected place.
Yes, it’s packed with science. Yes, it has moments that feel a little too convenient or questionable if you think too hard about them. But at its core, it’s about two beings from completely different worlds learning to trust each other, and saving everything because of it.
Rocky doesn’t just improve the story—he elevates it.
If you’re someone who enjoys character-driven stories wrapped in high-concept sci-fi, this is absolutely worth the read. Even if the science occasionally overwhelms or the logistics don’t always hold up under scrutiny, the emotional payoff makes it all worth it.
If you want a sci-fi story that blends big ideas with an even bigger heart, ‘Project Hail Mary’ is one to add to your shelf. Grab your copy through Bookshop.org and support independent bookstores while you read! Supporting this link helps sustain independent bookstores and keeps this blog thriving.
Check out other Sci-fi Book Reviews:
In the Lives of Puppets by TJ Klune
The Ministry of Time by Kaliane Bradley
Mickey7 by Edward Ashton
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