Published Mar 23, 2026, 9:11 AM EDT

The adaptation cuts some explanation of the mission and its effects

Photo: Jonathan Olley/Amazon MGM Studios/Everett Collection

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Phil Lord and Christopher Miller’s Project Hail Mary is highly faithful to Andy Weir’s 2021 science fiction book of the same name. Lord and Miller hit all the highlights of Weir’s story about a desperate mission to Tau Ceti to save Earth’s sun, but they do trim away some of the author’s explanations about the mission and the apocalyptic threat. So if you still have some questions after watching, here are the answers Weir wrote.

[Ed. note: This article contains major spoilers for both versions of Project Hail Mary ]

1 Where did astrophage come from?

The mission known as Project Hail Mary was created to deal with the threat of a microscopic organism dubbed astrophage that’s feeding on the Sun and causing it to dim, which will cool the planet and cause the extinction of all life on Earth.…