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The ending of Project Hail Mary sees Ryland Grace (Ryan Gosling) make the difficult choice to turn away from Earth, potentially dooming himself in order to save his alien friend, Rocky (James Ortiz), and the creature’s homeworld, Erid. Grace is successful in that mission, before the movie then reveals that he has actually settled into life on the alien planet, living inside a biosphere that allows him to survive. Does he ever go back to Earth? That’s left purposefully ambiguous, but he could choose to if he wanted, with Rocky confirming Erid’s scientists have figured out how to get him home.
Speaking with SlashFilm, directors Phil Lord and Christopher Miller explained the importance of that decision facing Grace:
“The thought process there is that it’s more powerful if it’s a choice. Right? So, yes, if he’s marooned there, that’s one thing. If he has the chance to go back and he would rather stay, that tells you everything about that relationship.”
Project Hail Mary’s Ending Slightly Changed The Book, But It Was Still Perfect
There are a few differences between the Project Hail Mary book and the movie when it comes to the ending: in the former, Rocky confirms that Earth’s sun has returned to its full pre-Astrophage brightness, confirming that the plan with the Taumoeba worked. The novel also reveals that Grace has been living on Erid for several years, and he has aged quite a bit. He’s 71 in Earth years, and while he’s only 53 in reality because of time dilation, he walks with a cane due to the planet’s gravity and his time spent travelling. The movie, meanwhile, adds a scene with Stratt that isn’t in the book.
Both, though, make it pretty clear that while Grace could go home, he doesn’t really want to. Part of that, of course, is that he doesn’t know what awaits him: it’s been decades and, while the sun returns to normal, it’s likely that billions of people have still died by that point, and who knows what the future of the planet will be.
