Project Hail Mary
by Andy Weir
Rocky is an intelligent alien from the planet Erid, who pilots the Eridian spacecraft Blip-A. Rocky’s species breathes ammonia, lives under extreme atmospheric pressures, perceives the world through echolocation, and communicates through harmonic tones. Despite significant biological and cultural differences, Rocky forms a deep bond with Ryland. Initially appearing simply as a curious and capable engineer, Rocky’s personality gradually reveals humor, loyalty, and deep emotional insight. His friendship with Ryland demonstrates the possibility of unity and understanding across vast differences. Rocky’s engineering expertise, inventive problem-solving, and unwavering optimism are crucial throughout the novel, assisting Ryland in overcoming numerous life-threatening challenges. Additionally, Rocky’s willingness to risk his own life for Ryland demonstrates compassion, suggesting the universal nature of selflessness and friendship.

Rocky Quotes in Project Hail Mary

The Project Hail Mary quotes below are all either spoken by Rocky or refer to Rocky . For each quote, you can also see the other characters and themes related to it (each theme is indicated by its own dot and icon, like this one:
Memory and Identity Theme Icon
).

Chapter 7 Quotes

Ilyukhina would have loved this moment. She would have been absolutely bouncing around the cabin with excitement. Yáo would have been stoic and steady, but he would have cracked a smile when he thought we weren’t looking.

Related Characters: Ryland Grace (speaker), Rocky , Commander Yáo , Ilyukhina
Page Number and Citation: 127
Explanation and Analysis:

Chapter 10 Quotes

My jaw drops. Yes, I’m in zero g. It still drops.
There was no pronunciation or inflection of the sounds. Just notes. Like whale song. Except not quite like whale song, because there were several at once. Whale chords, I guess. And he was responding to me. That means he can hear too.
And notably, the sounds were in my range of hearing. Some of the notes were low, some of them high. But definitely audible. That alone is amazing. He’s from a different planet, and totally different evolutionary line, but we ended up with compatible sound ranges.

Related Characters: Ryland Grace (speaker), Rocky
Page Number and Citation: 176
Explanation and Analysis:

Chapter 11 Quotes

“Do you ‘see’ with sound?” It would make sense. Humans use electromagnetic waves to understand our three-dimensional environment. So why couldn’t a different species use sound waves? Same principle—and we even have it on Earth. Bats and dolphins use echolocation to “see” with sound. Maybe Eridians have that ability, but on steroids. Unlike bats and dolphins, Eridians have passive sonar. They use ambient sound waves to resolve their environment instead of making a specific noise to track prey.

Just a theory. But it fits the data.

Related Characters: Ryland Grace (speaker), Rocky
Page Number and Citation: 189
Explanation and Analysis:

Chapter 12 Quotes

“I sleep better if you observe.”
“Why?”
He waves a few arms, trying to find a way to phrase it. “Eridians do that.”
Eridians watch one another sleep. It’s a thing. I should be more culturally sensitive, but he threw shade when I talked to myself. “Eridians are unusual.”
“Observe. I sleep better.”
I don’t want to watch a dog-sized spider not move for several hours.
“Have some other Eridian observe you.”
“No.”
“Why not?”
“I am only Eridian here.”

Related Characters: Rocky (speaker), Ryland Grace (speaker)
Page Number and Citation: 212
Explanation and Analysis:

Chapter 15 Quotes

“How many years have you been alive?”
Two hundred ninety-one years.” He pauses. “Yes. Earth years.”
Holy cow. Rocky is older than the United States. He was born around the same time as George Washington.

He’s not even that old for his species. There are old Eridians out there who were alive when Columbus discovered (a bunch of people already living in) North America.

Related Characters: Ryland Grace (speaker), Rocky (speaker)
Page Number and Citation: 261
Explanation and Analysis:

Chapter 16 Quotes

“[…] It is name of my mate.”
I widen my eyes. That little devil! He never told me he had a mate! […]
“You have a mate?”
“Unknown,” Rocky says. “Mate possibly has new mate. I gone a long time.”
“Sad,” I say.
“Yes, sad. But necessary. Must save Erid.”

Related Characters: Ryland Grace (speaker), Rocky (speaker)
Page Number and Citation: 273
Explanation and Analysis:

Chapter 19 Quotes

“Rocky! What have you done!”

The crazy bastard must have used the large airlock in the dormitory! He came into my partition to save me. And he’ll die because of it!

He shivers and folds his legs under himself.

Save…Earth…Save…Erid…” he quavers. Then he slumps down.

Related Characters: Rocky (speaker), Ryland Grace (speaker)
Related Symbols: Hail Mary
Page Number and Citation: 325
Explanation and Analysis:

Chapter 20 Quotes

He could have let me die. He should have, really. He could handle the centripetal force, no problem. He could have taken his time, whipped up an invention, and used it to get back control of the ship. Yeah, I know, he’s a good guy and he saved my life, but this isn’t about us. He has a planet to save.

Related Characters: Ryland Grace (speaker), Rocky
Related Symbols: Hail Mary
Page Number and Citation: 329
Explanation and Analysis:

Chapter 25 Quotes

“I’m going to miss you.” I take another swig of vodka. “You’re my friend. Heck, you’re my best friend. And pretty soon we’re going to say goodbye forever.”

Related Characters: Ryland Grace (speaker), Rocky , Eva Stratt
Page Number and Citation: 425
Explanation and Analysis:

Chapter 29 Quotes

So that’s what I’m left with. Option 1: Go home a hero and save all of humanity. Option 2: Go to Erid, save an alien species, and starve to death shortly after. I sob into my hands. All I see when I close my eyes is Rocky’s dumb carapace and his little arms always fidgeting with something.

Related Characters: Ryland Grace (speaker), Rocky
Page Number and Citation: 455
Explanation and Analysis:

Chapter 30 Quotes

“Rocky…that news about Sol…it…it makes my whole life have meaning. You know? I still can’t…I can’t…” I start sobbing again.

Yeah, I know. That’s why I wanted to be the one to tell you.”

Related Characters: Rocky (speaker), Ryland Grace (speaker)
Page Number and Citation: 474
Explanation and Analysis:
Get the entire Project Hail Mary LitChart as a printable PDF.
"My students can't get enough of your charts and their results have gone through the roof." -Graham S.
Project Hail Mary PDF

Rocky Character Timeline in Project Hail Mary

The timeline below shows where the character Rocky appears in Project Hail Mary. The colored dots and icons indicate which themes are associated with that appearance.
Chapter 10
Friendship and Survival  Theme Icon
...surface of the wall, he spots a three-fingered claw. The alien, which he quickly names Rocky due to its rock-like skin, taps the hex, so Ryland mimics the action. Rocky then... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
...inside, Ryland watches through the airlock window as the hexagonal barrier separating him from the Rocky vanishes, leaving the tunnel completely open. His initial excitement turns to frustration when a robotic... (full context)
Friendship and Survival  Theme Icon
...reenters the tunnel. The dividing wall has been replaced with a completely clear panel, revealing Rocky in full for the first time. He is a five-limbed, pentagonal being covered in a... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Rocky waves, so Ryland waves back. This basic exchange of gestures continues until Rocky taps the... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Determined to establish better communication, Ryland shows Rocky a clock, setting the hands to indicate when he will return after sleeping. Rocky seems... (full context)
Chapter 11
Scientific Discovery and Problem-Solving Theme Icon
...of his planned two-hour nap. Fighting off exhaustion, he moves through the airlock and finds Rocky waiting for him. While he slept, the Eridian had been busy—several new additions now occupy... (full context)
Scientific Discovery and Problem-Solving Theme Icon
Ryland attempts to redirect Rocky’s attention to the numbers, but the Eridian shows no signs of recognizing them. This leads... (full context)
Memory and Identity Theme Icon
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
...aid in communication. After some searching, he installs a waveform analysis program to break down Rocky’s vocalizations and prepares an Excel spreadsheet for tracking Eridian time. However, when he returns to... (full context)
Chapter 12
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Ryland wakes to the sound of Rocky tapping on the divider wall, and he realizes he has overslept by more than two... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Over several hours, they rapidly expand their vocabulary, with Ryland developing software to translate Rocky’s words in real time. Meanwhile, Rocky requires no such assistance, displaying an extraordinary memory and... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
...of sleep and learns that Eridians also require rest, though their sleep duration is unpredictable. Rocky insists on watching Ryland sleep, a cultural norm among his species. Ryland finds this odd,... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
...establish a shared unit of mass by measuring the weight of a small iron sphere Rocky provides. Since traditional weighing methods don’t work in zero gravity, he devises an experiment using... (full context)
Chapter 13
Friendship and Survival  Theme Icon
In the present, Ryland wakes up in the tunnel, where he now sleeps regularly because Rocky insists on watching over him. Over the past week, they have improved their shared vocabulary... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Ryland wants to determine if radiation exposure played a role in the deaths of Rocky’s crew. He explains that space contains high-speed hydrogen atoms, known as cosmic radiation, which can... (full context)
Chapter 14
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
In the present, Ryland successfully explains radiation and its lethal effects on biology to Rocky. Rocky becomes deeply saddened upon learning the truth about his crewmates’ deaths from radiation poisoning,... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Ryland considers the striking similarity between human and Eridian technology, despite evolving independently. Rocky explains this similarity logically: only civilizations within a narrow technological window would send a starship... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Returning to the present, Ryland and Rocky enthusiastically exchange details about their vastly different biological systems. Rocky explains Eridian physiology, revealing their... (full context)
Chapter 15
Friendship and Survival  Theme Icon
Ryland is curious about how Rocky plans to modify their connecting tunnel. Rocky needs massive atmospheric pressure to survive, and Ryland’s... (full context)
Friendship and Survival  Theme Icon
As Ryland guides Rocky through the Hail Mary, he is surprised by Rocky’s significant mass (over 300 pounds), due... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Back in the present, Rocky moves an enormous volume of equipment from the Blip-A into Ryland’s ship, turning the dormitory... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
In their ongoing effort to communicate clearly, Rocky introduces new words to precisely describe time units. Ryland learns that Rocky has been alone... (full context)
Chapter 16
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Ryland restores artificial gravity by spinning up the ship’s centrifuge. Rocky, now safely inside his xenonite habitat, experiences Earth gravity for the first time and notes... (full context)
Friendship and Survival  Theme Icon
Sacrifice and Duty Theme Icon
When Ryland stresses the urgency of saving Earth quickly, Rocky is puzzled, noting that Erid, his home planet, has at least 72 years before severe... (full context)
Friendship and Survival  Theme Icon
Sacrifice and Duty Theme Icon
When Rocky enthusiastically proposes that after collecting Astrophage samples, Ryland can return to Earth to save humanity,... (full context)
Scientific Discovery and Problem-Solving Theme Icon
...local planet intersecting the Petrova line, where he plans to collect extensive samples of Astrophage. Rocky has surveyed the system during his decades-long isolation, providing valuable data on the planet’s orbit... (full context)
Friendship and Survival  Theme Icon
As they travel, Rocky decides the planet’s current name, Tau Ceti e, is boring, and insists Ryland rename it.... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Later, Rocky prepares to eat, something Ryland has never seen before. Initially reluctant due to the private... (full context)
Chapter 17
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Ryland wakes to find Rocky staring at him, something that’s becoming routine despite its unsettling nature. After breakfast, Ryland heads... (full context)
Memory and Identity Theme Icon
Friendship and Survival  Theme Icon
As they approach Adrian, Rocky and Ryland activate the External Collection Unit, a device designed like specialized flypaper to collect... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
In the end, the orbital insertion around Adrian goes perfectly, validating Rocky’s precise astronomical data. Rocky demonstrates impressive engineering by adapting Eridian camera equipment to perceive visible... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Both Ryland and Rocky quickly realize that Adrian is not merely infected by Astrophage, but it is also their... (full context)
Chapter 18
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
...present, Ryland struggles in the lab after an experiment to isolate an Astrophage predator fails. Rocky and Ryland realize they have misunderstood something crucial about the predator’s environment. Together, they theorize... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Sacrifice and Duty Theme Icon
As Ryland works, Rocky reveals the surprising reason behind his ship’s surplus Astrophage fuel: Eridians never discovered relativistic physics.... (full context)
Chapter 19
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Rocky initially struggles to accept the reality of relativity, resisting the idea until Ryland’s patient explanations... (full context)
Scientific Discovery and Problem-Solving Theme Icon
...alarmed to see the air literally glowing red-hot from the intense infrared radiation. They deploy Rocky’s specially designed atmospheric sampler attached to the xenonite chain, letting it plunge downward into the... (full context)
Scientific Discovery and Problem-Solving Theme Icon
Sacrifice and Duty Theme Icon
Ryland struggles back inside, barely surviving as the ship violently shakes. Rocky reports that the hull is bending inward dangerously. The Hail Mary is suddenly and inexplicably... (full context)
Friendship and Survival  Theme Icon
Sacrifice and Duty Theme Icon
Just when death seems inevitable, Rocky appears, having entered the human habitat without protection. He frees Ryland from the wreckage, saving... (full context)
Chapter 20
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
...again, though the ship is now upside down and chaotic. Debris litters every surface, and Rocky lies motionless, overheated and unconscious from the earlier disaster. Ryland knows he has to move... (full context)
Friendship and Survival  Theme Icon
Sacrifice and Duty Theme Icon
Climbing through the inverted ship, Ryland straps Rocky’s heavy body to his shoulders using safety tethers, dragging him through the lab and into... (full context)
Friendship and Survival  Theme Icon
Sacrifice and Duty Theme Icon
Ryland wakes hours later, wrapped in bandages, his lungs raw and his arm scorched. Rocky still hasn’t moved. Unsure if he’s alive or dead, Ryland turns to his notes on... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Sacrifice and Duty Theme Icon
...the box to the wall of the airlock, Ryland drills into the xenonite and blasts Rocky’s vents with compressed Eridian air. It’s a gamble, but it works—black soot bursts from Rocky’s... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Sacrifice and Duty Theme Icon
With Rocky still unresponsive, Ryland turns back to the lab. He recreates the environment of Adrian’s atmosphere... (full context)
Chapter 21
Memory and Identity Theme Icon
Friendship and Survival  Theme Icon
...memory haunts Ryland as he writhes in pain from his chemical burns. Suddenly, he hears Rocky tap on the airlock wall, which pulls him out of his spiral. The Eridian is... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
The two friends rest and recover, both physically battered but determined to press on. Rocky, unable to move far, constructs a special chamber to help Ryland safely retrieve a sample... (full context)
Scientific Discovery and Problem-Solving Theme Icon
Together, Ryland and Rocky cultivate a thriving population of Taumoeba in a controlled breeding chamber. With Rocky’s engineering and... (full context)
Scientific Discovery and Problem-Solving Theme Icon
Sacrifice and Duty Theme Icon
...just enough intelligence to stay ahead of danger, and that may explain their uncanny parity. Rocky accepts the theory with his usual pragmatism, noting that both of them, despite all their... (full context)
Chapter 22
Friendship and Survival  Theme Icon
...present, total darkness swallows the Hail Mary, leaving Ryland scrambling to understand what’s gone wrong. Rocky, unfazed without eyes or reliance on human systems, listens as Ryland explains that all ship... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Determined to salvage what they can, Ryland and Rocky brainstorm. The remaining Astrophage in Rocky’s sealed containers can power the ship’s electrical systems if... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
...The goal is to use their thrust to stabilize the ship’s spin and navigate toward Rocky’s larger vessel, which still has a full Astrophage supply. Ryland performs another dangerous EVA to... (full context)
Chapter 23
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Back in space, Ryland and Rocky work together to solve their next major crisis: returning to Rocky’s ship. With limited fuel... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Emotionally drained, Ryland rages against the failure. Rocky is equally disheartened, collapsing in his bulb, but he insists they keep going. Ryland agrees,... (full context)
Chapter 24
Memory and Identity Theme Icon
Friendship and Survival  Theme Icon
Sacrifice and Duty Theme Icon
...he remembers from that moment. Stratt’s manipulation worked perfectly—he’s now too invested to walk away. Rocky notices Ryland’s despair and tries to snap him out of it with logic and teamwork.... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
As the ship cruises toward the Blip-A, Ryland and Rocky undertake a risky maneuver to regain artificial gravity sooner rather than later. They rig up... (full context)
Scientific Discovery and Problem-Solving Theme Icon
...with a barely harmful level of nitrogen and gradually increase it, selecting for resistant strains. Rocky eagerly accepts the plan, building new tanks with precision control over gas composition. Over the... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Just as they hit a major milestone with the Taumoeba evolution, Ryland and Rocky complete their approach to the Blip-A. Rocky had wisely programmed the ship to emit periodic... (full context)
Chapter 25
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
After reconnecting their ships, Ryland and Rocky finally succeed in their evolutionary project: Taumoeba-35 survives in 3.5 percent nitrogen, meaning it can... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
...weren’t designed for human entry, so he has to improvise and cut access holes, which Rocky will later reseal with xenonite. Nitrogen gas proves incredibly effective at sterilizing the tanks—lethal even... (full context)
Memory and Identity Theme Icon
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
Sacrifice and Duty Theme Icon
...just enough coma slurry to survive the trip—but only because Yáo and Ilyukhina died. When Rocky learns of the problem, he offers a solution: to build new fuel bays from spare... (full context)
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
 Later, after an intense EVA, Ryland finishes installing the replacement tanks. Rocky’s fuel bays, though made from scavenged materials, are structurally sound and functional. Meanwhile, Taumoeba-78 survives... (full context)
Friendship and Survival  Theme Icon
Finally, the time to part arrives. Rocky seals off the connecting tunnel, and both ships complete final checks. Rocky takes the Earth... (full context)
Chapter 26
Friendship and Survival  Theme Icon
Sacrifice and Duty Theme Icon
...by the time he arrives, everyone he once knew may be gone. Additionally, Ryland tracks Rocky’s ship every day using the Petrovascope, knowing it’s only a matter of time before it... (full context)
Scientific Discovery and Problem-Solving Theme Icon
Ryland’s focus turns to preparing the beetles for emergency deployment. He installs Rocky’s mini-farms, adjusts the guidance systems, and methodically refuels them using Astrophage from a heavy container... (full context)
Chapter 28
Friendship and Survival  Theme Icon
Scientific Discovery and Problem-Solving Theme Icon
...resolves to house the Taumoeba in metal instead. But then a terrifying realization hits him: Rocky uses the same strain in xenonite farms aboard the Blip-A, and his entire ship, including... (full context)
Chapter 29
Friendship and Survival  Theme Icon
Sacrifice and Duty Theme Icon
Ryland builds a new Taumoeba farm from aluminum, but Rocky’s ship presents a graver concern. The Blip-A’s engine flare has disappeared, suggesting a total fuel... (full context)
Scientific Discovery and Problem-Solving Theme Icon
Sacrifice and Duty Theme Icon
...Earth with mini-farms of Taumoeba and complete data packages. Then, he begins his search for Rocky’s ship. With limited information and a massive search area, he improvises a radar-like system using... (full context)
Friendship and Survival  Theme Icon
Sacrifice and Duty Theme Icon
Upon arrival, Ryland tries everything to get a response from Rocky—radio, lights, noise—but hears nothing. Fearing Rocky may be dead, he performs an EVA and physically... (full context)
Friendship and Survival  Theme Icon
Sacrifice and Duty Theme Icon
...friends reunite, and Ryland explains that he sent the beetles to Earth, choosing to save Rocky and the Eridians rather than himself. Rocky, horrified, insists they will find a way to... (full context)
Friendship and Survival  Theme Icon
Sacrifice and Duty Theme Icon
...and doesn’t require extreme heat. With a sudden surge of hope, he considers the possibility. Rocky confirms he has 22 million kilograms of Taumoeba in the fuel bays. After all of... (full context)
Chapter 30
Memory and Identity Theme Icon
Sacrifice and Duty Theme Icon
One day, Rocky excitedly shares monumental news: Sol, Earth’s sun, has returned to full brightness. This confirms that... (full context)