What happens at the end of the Hail Mary movie? It goes one scene further than the book

Directors Phil Lord and Chris Miller and screenwriter Drew Goddard kept the divisive ending intact, then added one scene Weir never wrote.

Spoilers for both versions from here.

How it ends

Ryland Grace (Ryan Gosling), the science teacher turned accidental astronaut, cracks the problem he was sent to Tau Ceti to solve: the taumoeba organism that can kill the Astrophage dimming Earth's sun. He loads samples and instructions onto probes and fires them back towards Earth. Then, instead of using his remaining fuel to go home, he turns the Hail Mary around to rescue his stranded alien friend Rocky (voiced by James Ortiz).

Grace ends the film living on Rocky's home planet, Erid, where the Eridians have built him an enclosed habitat — and where he's back doing the thing he was always best at: teaching science, this time to Eridian children. That's exactly where Weir's novel leaves him.

The scene the book doesn't have

The novel never leaves Grace's point of view. The film does — once, right at the end. It cuts back to Earth, years later, where an older Eva Stratt (Sandra Hüller), the project's famously unsmiling taskmaster, receives Grace's probes on a planet of frozen oceans and a dimmed sun. She reads the message. And for the first time in the entire film, she smiles.

Goddard told Mashable in 2026 the epilogue was deliberate:

"It's a triangle between three characters, and we need to give her her moment," he said of Stratt.

In the book, Grace only learns second-hand — sixteen years later, via Eridian telescopes — that the sun has returned to full strength. The film shows the delivery instead, from the receiving end.

What else changed?

• The coma-resistance gene — a whole subplot about crew selection in the novel, cut entirely from the film.
• The Sahara plan — the book's scheme to cover the desert in solar panels to breed Astrophage fuel doesn't appear.
• Grace's habitat — humbler in the book, where he's also noticeably older; the film gives him a beachfront biodome built from xenonite and salvaged ship parts.
• The door home — the film suggests the Hail Mary could still carry Grace back to Earth one day. The novel implies he has little appetite for the trip.

Lord told /Film the filmmakers "were going to hold the line on this ending" — no last-minute return to Earth, no reunion scene. The Erid finale stays.