Project Hail Mary: Movie vs Book
Everyone knows that Ryan Gosling is a likable person, and Project Hail Mary is a fun and likable movie. The movie includes a cute rock/spider alien, and all the fun things science has to offer. Overall, it is a fun movie. A movie that families can have fun watching, where kids can be inspired to become middle school teachers and/or do something in the field of science, whether biology or physics.
Now before we get into what I'm gonna say from here on out, it may seem like I hated the movie. However, I would like to say that I enjoyed the movie and my overall experience in the movie theatre was really good. Additionally, there was this incredibly kind guy that literally gave up his nicer seat so my partner and I could sit together. With that act of kindness alone, I will remember him and this movie forever in my heart. So let's get started with my thoughts, shall we?
After I read the book, there were two key moments that I really wanted the movie to highlight. I know, I know, I read the book before I saw the movie. I was even warned. Almost, if not all movies, turn out to be a disappointment when compared to their book counterparts. I wasn't expecting it to be perfect, but I felt like these moments were like the crux or the heart of the story. So I was very excited to see them come to life, and was somewhat disappointed by the execution.
The Fun Problem
While watching the movie, it was fun. Fun is not bad per se, but it felt like most of the movie was just for fun, fun, and fun. The book, though admittedly fun to read, also had scientific elements. Sure, the movie included some calculations here and there to showcase science, but I felt that it also lacked another aspect of science, or any other craft for that matter, which is rigor. The book (and real life) exhibits that things don't just magically get discovered. There also has to be some experimentation, some chances of being wrong, and finally time.
Take how Grace and Rocky learn to communicate. In the book, Grace spends a significant amount of time establishing a shared number system, then units of measurement, then basic vocabulary. He gets things wrong. He has to backtrack. He misinterprets Rocky's responses and has to recalibrate. It's painstaking and methodical. While reading the book, I personally felt impatient and that Earth is dying. They should hurry up! However, I came to realize that Grace and Rocky both had to understand each other and take their time to rightfully do so because a single miscommunication, whether in the units of measurement (scientific) or in vocabulary, can be catastrophic for the survival of both life forms. Additionally, it's also where their trust is actually built.
The movie compresses all of this into what is essentially a feel-good montage. Now, I get that the film can't spend 40 minutes on language calibration without losing the audience. That's a fair constraint. But even a single scene showing Grace getting something wrong and having to start over would have communicated that rigor without slowing the pace. It would have shown the audience that science isn't a highlight reel of correct answers. Science is a process of forming hypothesis after hypothesis until you prove them wrong or right.
The same goes for the chain links and xenonite fabrication. In the book, it's clear how long, tedious, and physical the process is. It took a lot of calculations to get the theoretical strategy right. The movie skips right past those. Again, I'm not asking for a ten-minute manufacturing sequence. But even a line of "three weeks later" or a shot of Grace looking exhausted next to a growing pile of links would have communicated the weight of time without costing the movie its momentum.
Rigor is the heart of the scientific method. It is the part that most people never see and some never appreciate because it's not glamorous. The movie simplifies this into something much closer to a eureka moment. That's a missed opportunity, because the book shows that the things we do with rigor can also be fun. Grace seemed to enjoy learning so much about Rocky's planet — how their atmospheric makeup was different from Earth, how their scale for time and distance worked differently. The joy of science in the book wasn't separate from the grind. Th joy can come from the grind.
Grace's Act of Selflessness
Grace's chemistry with Rocky in the movie was cute and beautiful. He also had great chemistry with Stratt. However, I felt that the movie didn't quite seem to deliver the act of selflessness Grace had given to Rocky. With some thought, I have concluded that this was partly because the movie overlooked certain facts that, while subtle, carry enormous weight.
First, the movie didn't mention that only a handful of people carried the rare gene needed to survive the medically-induced coma required for space travel. This removed the gravity of how crucial it was for Grace to go on the mission. It was important for Grace to go not only because he knew so much about the mission, but because other people would essentially die before the mission even started.
Now, a counterargument here might be that cutting the gene detail actually helps the theme. It avoids making Grace feel genetically destined for heroism and instead frames him as an ordinary person rising to an extraordinary occasion. However, the gene isn't what makes Grace heroic, it's what makes him irreplaceable. Those are different things. The tragedy in the book isn't that a special person was sent to die. It's that humanity had almost no one else to send. That desperation is part of the story's weight, and without it, the mission feels less like a last resort and more like a job assignment.
The movie also makes Stratt more humane compared to the book because she looked conflicted when she forced Grace to go on the mission. In the book, she was very matter of fact, straightforward, and calculating, but I believe her coldness didn't mean she was without guilt, or that she was simply evil. She had already accepted that she would go to prison for the things she'd done. She simply understood that there were far more terrible things at stake than her own conscience or freedom. She had weighed her own damnation against the extinction of all life on Earth and made her choice without flinching.
The movie's version where she visibly wavers, reduces her to the reluctant authority figure who "didn't want to do this." Both the book and the movie build Stratt up as a strong, independent leader, someone capable of going against every world leader on the planet. So I find it unsatisfying that the movie suddenly U-turns and portrays her as someone who can't hold that composure when it matters most, as though she needs Grace's forgiveness before she can go through with it.
In the book, Stratt has already grieved her own future. She looks Grace in the eye, calls him a coward hiding behind his kids, and sends him on a suicide mission anyway. That version of her is more unsettling, but it's also what gives Grace's eventual choice its full weight. When he decides to go back for Rocky, he's not just defying a conflicted bureaucrat. He's proving wrong the most ruthlessly competent person on Earth, the one who had already written him off. That's a far more powerful act of selflessness and courage.
Finally, there's the rescue itself. The movie briefly delves into Grace calculating how to get to Rocky by drawing a diagram of Rocky's position, Grace's position, and Earth on a whiteboard. It was kinda cute and heartwarming. But, it doesn't show the confusion, the reluctance, and the genuine internal war. In the book, Grace runs the numbers over and over again. He realizes that going to Rocky means he probably can't make it home because even if he doesn't run out of fuel, he will run out of food. He argues with himself. He considers just leaving but he chooses Rocky anyway.
I understand that internal monologue is notoriously difficult to put on screen. But it wouldn't have taken voiceover to communicate this. Even a scene of Grace staring at the numbers, putting his head in his hands, pacing the ship looking tormented and accepting death. That visual alone would have shown the audience what this moment costs him. Imagine waking up in space, accepting that you are going to die. Then, you were given hope that you might survive due to Rocky’s ship having excess fuel. That hope is then crushed because Grace realizes saving Rocky (and his planet) is the right thing to do, even if it means sacrificing your chances to live and go back to Earth.
The Rarity of It All
Don't get me wrong. The movie was fantastic, everybody was laughing all throughout and was smiling by the end of it. It was mostly true to the book given the limited time the movie had. However, there were so many things mentioned or implied in the movie that felt like they were just mentioned for the sake of it. They were supposed to add richness and layers to the story but the execution felt flat. The bromance was already beautiful with their banter and jokes, but it would've shown brighter and more precious, if their selflessness for each other was better executed. In order for Grace and Rocky to meet, their life forms had to have the same catastrophic problem, a similar amount of distance to Tau Ceti, and finally, a similar level of intelligence to be able to get to the said star and communicate with each other. Just as it is extremely rare to meet another life form from another planet, it is just as rare and precious to have that type of selfless relationship and togetherness even within the same planet.