Project Hail Mary vs The Martian: Which to Read First?
Project Hail Mary and The Martian are Andy Weir's two best science-fiction novels. Here's how they differ, what each does best, and which to read first.
Andy Weir turned hard science fiction into a mainstream phenomenon with two novels built on the same irresistible formula: a smart, funny narrator facing impossible odds, solving one life-threatening problem after another with real science and relentless good humour. The Martian (2011) launched his career and a hit film; Project Hail Mary (2021) cemented his reputation and became many readers’ favourite. If you are deciding which to read first — or whether to read both — here is how they compare.
At a Glance
| The Martian | Project Hail Mary | |
|---|---|---|
| Published | 2011 | 2021 |
| Setting | Mars, near future | Deep space, near future |
| Premise | An astronaut stranded on Mars | A lone survivor on a mission to save Earth |
| Scale | Personal survival | Extinction-level stakes |
| Tone | Grounded, comedic | Comedic, with bigger heart and wonder |
| Read first? | Yes, for most readers | Second |
What The Martian Is About
The Martian strands astronaut Mark Watney alone on Mars after his crew, believing him dead, evacuates in a storm. With no way to communicate and limited supplies, Watney has to “science the hell out of” his situation — growing food, jury-rigging equipment, and surviving long enough for a rescue that may never come. Told largely through his wry, profane log entries, it is a gripping, frequently hilarious celebration of human ingenuity. The science is rigorous, the stakes are intensely personal, and the result reads like a survival thriller with a comedian at the controls.
What Project Hail Mary Is About
Project Hail Mary opens with a man waking up alone on a spaceship with no memory of who he is or why he is there. As his memories return, he realises he is humanity’s last hope against an extinction-level threat to the Sun. To say much more would spoil the novel’s best surprises — but it expands Weir’s formula to a galactic scale, adds a central mystery that unspools alongside the present-day action, and introduces one of the most beloved relationships in recent science fiction. It keeps everything that made The Martian fun while reaching for genuine wonder and emotion.
How They Differ
The first difference is scale. The Martian is intimate: one man, one planet, one goal — get home. Project Hail Mary is cosmic: the fate of all life on Earth, a journey to another star. If you prefer tight, grounded survival, Watney’s story wins; if you want sweeping, idea-driven sci-fi, Ryland Grace’s does.
The second difference is solitude versus companionship. The Martian is fundamentally a solo show — Watney’s isolation is the point. Project Hail Mary introduces an element of partnership that becomes its emotional heart and gives the book a warmth The Martian never quite reaches. Readers who wished Watney had someone to talk to will love what Weir does here.
The third difference is structure. The Martian moves in a straight line: problem, solution, next problem. Project Hail Mary interleaves a present-day mission with a slowly recovered backstory, so a second mystery — how did he get here? — drives you forward alongside the survival stakes. It is the more ambitious construction.
Which to Read First
For most readers, start with The Martian. It is the leaner, more grounded introduction to Weir’s style, it stands completely alone, and its smaller scale makes the formula easy to fall in love with before he scales it up. Read Project Hail Mary second, when you already know you enjoy Weir’s voice and are ready for a bigger, stranger, more emotional ride.
The exception: if you have already seen the film of The Martian and want the story that surprised even longtime fans, you can comfortably begin with Project Hail Mary — its mystery structure rewards going in knowing as little as possible.
Read Both: How They Complement Each Other
These are not an either/or. Read back to back, they show Weir growing as a novelist — the same problem-solving delight and humour, but with Project Hail Mary adding heart, scope, and wonder. Together they make the strongest case for him as the defining writer of optimistic, competence-driven science fiction — the rare author who can make a chapter about orbital mechanics or potato farming genuinely unputdownable, and who trusts his readers to enjoy being smart along with his heroes.
What to Read After
Once you have read both, Weir’s third novel, Artemis, is the obvious next stop, though most fans consider it a notch below these two. For more in the same vein of resourceful, science-forward storytelling, browse our best sci-fi books of all time roundup, which gathers many more space-survival and first-contact reads.
It is also worth choosing your format. Both novels are superb on audio — The Martian for Watney’s stand-up-comic log entries, and Project Hail Mary for a sound-design conceit that the print edition simply cannot reproduce and that has made the audiobook a fan favourite. If you have one foot in audiobooks, Project Hail Mary is one of the rare cases where the narrated version is arguably the definitive one, which can tip the order in its favour.
The short answer to the question everyone asks: read The Martian first for the lean, funny survival thriller, then Project Hail Mary for the bigger, more moving adventure — and you will understand exactly why Andy Weir made hard science fiction a bestseller again.
Frequently Asked Questions
Should I read The Martian or Project Hail Mary first?
Either works as a standalone, but reading The Martian first is the natural choice for most people. It is Andy Weir's debut, more grounded and self-contained, and it introduces his signature mix of problem-solving and humour at a smaller scale. Read Project Hail Mary second, when you are ready for a bigger, stranger, more emotional story.
Which is better, The Martian or Project Hail Mary?
Many readers rate Project Hail Mary as the better book — it keeps everything that made The Martian work while adding higher stakes, a clever mystery structure, and a surprisingly moving friendship at its core. The Martian is leaner and more realistic. Both are excellent; Project Hail Mary tends to be the bigger emotional experience.
Are The Martian and Project Hail Mary connected?
No. They share an author and a style — a resourceful narrator solving life-or-death problems with real science and a lot of jokes — but they are completely separate stories set in different scenarios. You can read them in any order without missing anything.
