How Goofy was the Science of “Project Hail Mary?” – April 2026

Cynthia Zager Godwin
17 hours ago
5 min read

Updated: 10 hours ago

IN THIS POST:

Entertainment Value of "Project Hail Mary"

The Plot

The Science - SKIP this if you haven't seen the move!!

Where's the Faith?

The film, “Project Hail Mary,” is based on Andy Weir’s 2021 book of the same name. He is famous for his novel, “The Martian,” nominated for seven academy awards in 2016. A blockbuster of a movie, it won none. But science fiction rarely wins top Oscars, unless it's in the technical category.

Entertainment Value

“Project Hail Mary,” is a feel good, popcorn, ride of a movie made by Amazon MGM Studios. It has no sex, no swearing, no violence, and makes no political statements. A good family fun movie like, “Project Hail Mary,” hasn’t been made in a long, long time.

The overall consensus of friends who saw the movie was they absolutely loved it! Even people who read Weir’s novel of the same name, thought the movie was great. It's no wonder movie-goers made, “Project Hail Mary,” the second highest-grossing film so far of 2026 with over half a billion in ticket sales.

The Plot

A lone astronaut, Dr. Grace (Ryan Gosling), wakes up on a spaceship. His job, save Earth. The planet is in crisis due to a sun-killing microbe. Dr. Grace must “work the problem” with an alien he’s met in order to save both their planets. It’s a race against time. Can they solve the microbe-munching catastrophe and get the answer back home in time?

The Science (if you haven’t seen the movie, you may want to wait to read this)

Despite most peoples’ enjoyment of the movie, I didn’t love the film. This is why you don’t go to the movies with a science teacher!

Don’t get me wrong. I love science fiction movies! Am I glad they made this one? Yes! You have to take some license in any science fiction film. I just like to stick as close to the science as possible.

Below are some of the science-related glitches.

1.) Doctor of Molecular Biology – Teaches Junior High School?

This was the first problem I had with suspending my disbelief.

Ryland Grace (Ryan Gosling), is a junior-high science teacher. His kids love him. Government scientists show up at his classroom and we find out Grace has a doctorate in molecular biology. A molecular biologist with a PhD. And he teaches junior high?

Oh, but Dr. Grace is a disgraced molecular biologist. Really? He couldn’t find a more challenging job than teaching junior high?

2.) Virus with the Munchies Survives Wild Temperature Swings

The astro-phage bacterium or virus or whatever it was had my eyeballs popping out of my head. It’s attacking the Sun and will destroy it and everybody on Earth in about 30 years.

This is one amazing microbe! It can withstand the vacuum of other space to travel to the Sun (how, we don’t know). Along the way, the microbe baked at over 500° F (260° C) and froze at -250° F (-121° C).

If that isn’t astonishing, the virus that sounds like bacteria (phages are virus's that attack bacteria) survives its toasty trip through the Sun’s corona. The corona cooks along at 2-5 million degrees Fahrenheit (1-3 million Celsius). The microbe then descended to the Sun’s surface, which is a blistering 10,000 °F (500 °C) and started “eating” the Sun.

3.) No Sex for Rocky, the Alien

Almost all life on Earth is carbon-based, except for some microorganisms that live near “black smokers” on the bottom of the ocean. They subsist on chemicals.

Carbon is light, with an atomic mass of 12. The next most likely element used for life would be silicon (Si) with an atomic mass of 28.

If a carbon-based person weighs 200 pounds (91 kg) the same size silicon-based person would weigh 460 pounds (209 kg). That puts tremendous stress on the heart and circulatory system.

Carbon is also terribly versatile. It can bond with itself. It can bond with four other elements. It forms long chains, branches, and even rings. This allows carbon to form lots of diverse materials needed for life like DNA (about 40% carbon).

If you can’t make DNA, you can’t make RNA, can’t make proteins, and can’t make the 75,000 enzymes that run the human body. No DNA? No baby Rockys. Sorry!

4.) Communication with the Rock Buddy

Rocky was short, which helps with his overweight problem. But I didn’t see a face. How does Rocky collect photons and then interpret them to "see" Dr. Grace? How does he gather acoustic energy or sound waves to "hear" Dr. Grace? Talk? Eat and digest to sustain himself?

5.) Math is a Universal Language

Dr. Grace used the numbers on the face of a clock to communicate with Rocky. How did Rocky know what the numbers stood for? Did he have Google Translate?

To the novel’s credit, it used much more complicated, but universally understood items known to scientists, such as the spectral lines of hydrogen and the formula for gravitational acceleration.

6) The “So What” Problem

Why does rock-based life need the sun? Rocks don’t rely on photosynthesis to supply them with energy.

We need the Sun to provide energy for plants, which in turn supply energy for animals, and ultimately us. If Rocky’s planet goes dark, rocks will still exist. Rocky could have stayed home.

7) Massive Stellar Distances – Not a Walk in the Park

The star, Tau Centi, Dr. Grace travels to in the movie is 12 light-years from Earth. Even traveling close to the speed of light, 186,000 miles per second (300,000 km/sec), by the time Dr. Grace makes it to Tau Centi, solves the microbe with the munchies problem, and messages Earth, more than 30 years have likely passed.

At this point, the Sun is probably so dim, Earth is dying, if not dead.

8.) Additional Questions

There are additional problems but the above are quite enough. "Project Hail Mary" was still a fun movie!

WHERE'S THE FAITH?

This website is about science and faith, so what's the faith aspect in "Project Hail Mary?"

The same God who created the exploding overabundance of life on our planet, also created the laws that govern the universe. If we find intelligent life beyond Earth, and I’m not holding my breath, it’s going to follow the same laws of biology, chemistry, and physics present on Earth.

Carbon-based life makes the most sense from a biological and chemical perspective, not silicon-based rock creatures.

The human design is an excellent model. Bi-pedal for getting the organism around. Arms for appendages with an opposable thumb to manipulate objects. Eyes, nose, and mouth on the top, so the being doesn’t drown in a mud puddle, or go blind from kicking up dirt or running into a rock.

Are these intelligent aliens, if they exist, going to visit us? The extreme distances between the stars, massive amount of fuel (energy) needed to power the craft, shielding from radiation, and time required for a single trip, make the physics daunting, to say the least. In my opinion, we're "home alone."