Science Friday

‘Project Hail Mary’ brings a new kind of alien to the big screen

March 20, 2026

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  • The adaptation of Andy Weir's *Project Hail Mary* is praised for successfully bringing the non-humanoid alien, Rocky, to life through body language and sound design, despite the author initially visualizing the character as a 'blob'. 
  • Astrobiologist Mike Wong identifies with the protagonist Ryland Grace's portrayal as an outsider scientist whose non-water-based life theories mirror real-world challenges faced by the astrobiology community. 
  • Andy Weir intentionally designed the alien threat, Astrophage, as a microscopic, invasive biological entity that consumes stellar energy, reverse-engineering the plot from this scientific concept, which Mike Wong likens to an allegory for climate change. 

Segments

Weir’s Adaptation Experience
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(00:02:38)
  • Key Takeaway: Andy Weir was highly involved as a producer on the film adaptation of Project Hail Mary and noted that actor Ryan Gosling frequently ad-libbed lines that were better than the script.
  • Summary: Andy Weir served as a producer on the film and was present for the entire shoot. He mentioned that Ryan Gosling often improvised dialogue, leading to superior takes, such as the line about Meryl Streep being able to play anything. Weir also noted that he had minor ‘gripe’ about a few omitted scenes but felt the adaptation was great overall.
Astrobiologist’s Identification with Grace
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(00:06:07)
  • Key Takeaway: Dr. Mike Wong strongly identifies with Ryland Grace’s ostracization for proposing non-water-based life theories, a concept Wong actively researches and advocates for in astrobiology.
  • Summary: Wong related to Grace being shunned for his dissertation on non-water-based life, as Wong himself writes papers advocating for broader definitions of life beyond Earth’s characteristics. He also shares Grace’s passion for teaching, noting that astrobiology often faces skepticism about being a ‘real science’ until life is found in space. Wong humorously counters this skepticism by stating that humanity itself is ’life in space’.
Weir’s Character Development
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(00:08:42)
  • Key Takeaway: Ryland Grace was the first main character Andy Weir created that was not directly based on his own personality traits, focusing instead on pathological conflict aversion.
  • Summary: Weir contrasts Ryland Grace with his previous protagonists: Mark Watney (The Martian) is an idealized version of Weir, and Jazz Bashara (Artemis) embodies his past flaws. Grace was developed around the core trait of being pathologically conflict-averse, leading him to retreat to middle school teaching rather than defend his theories in academia.
Astrophage Origin Story
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(00:13:15)
  • Key Takeaway: The Astrophage, the microbial alien species dimming the sun, was reverse-engineered from Andy Weir’s desire to create a story centered around humanity having access to mass-conversion-based fuel.
  • Summary: Weir started by wanting a story where humanity possessed mass conversion fuel, which led him to consider a biological entity that absorbs energy and reproduces itself. He determined this entity, Astrophage, would live on the surface of a star to gather necessary elements for reproduction, resulting in the catastrophic side effect of dimming the sun.
Astrophage vs. Traditional Aliens
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(00:16:19)
  • Key Takeaway: The Astrophage subverts expectations of alien encounters by being a microscopic organism minding its own business, serving as an allegory for climate change rather than a direct, monstrous threat.
  • Summary: Unlike monstrous aliens like those in the Alien series, Astrophage are microscopic and not actively infecting humans; they are simply absorbing sunlight to power themselves. This slow, existential threat, which dims the sun over decades, functions as a powerful allegory for climate change.
Rocky’s Non-Humanoid Design
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(00:17:44)
  • Key Takeaway: Andy Weir intentionally designed Rocky to be visually and biologically incompatible with humans, utilizing five-fold symmetry and an internal sound production system analogous to whale song.
  • Summary: Weir focused heavily on Iridian biology, noting that Rocky’s species is pentasymmetrical and lacks an external respiratory system, relying on internal air bladders pushing across vocal cords for sound production, similar to how whales recycle air. This commitment to making the alien truly alien contrasts with typical humanoid sci-fi aliens, making the audience’s emotional attachment to the rock-like creature a significant feat of the film’s direction.
Scientific Gripes and Relativity
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(00:23:47)
  • Key Takeaway: The film omitted detailed exploration of relativity, which was significant in the book regarding time dilation, because screenplays require laser focus on plot advancement over complex scientific explanations.
  • Summary: Mike Wong noted the omission of relativity’s role in time dilation, though the film does mention Ryland Grace experienced four years during a 13-year journey. Weir explained that such complex physics concepts are often cut from screenplays to maintain forward momentum. Weir also clarified that Iridians understand light through technology, even if they lack the biological organs to perceive it directly.