How Was the Voice-Over for Space Brothers Recorded in Space?


Imagine you’re floating in the boundless expanse of space, millions of miles from home, and yet, your task isn’t just to conduct experiments or maintain the International Space Station (ISS). You’re there to breathe life into an anime character for ‘Space Brothers,’ making history as Akihiko Hoshide did.

Photo: Japan Aerospace Exploration Agency (JAXA) astronaut Akihiko Hoshide, attired in a training version of his Extravehicular Mobility Unit (EMU) spacesuit.

Key Takeaways

  • Astronaut Akihiko Hoshide recorded the voice-over aboard the ISS using specialized, compact recording equipment designed for minimal background noise.
  • The recording took place in mid-September during Hoshide’s four-month mission, involving bone density and satellite experiments.
  • Essential equipment selection focused on lightweight devices that function under microgravity and could deliver high-quality audio.
  • Collaboration with audio technology experts ensured the recording’s quality, overcoming challenges like microgravity and spacecraft noise interference.
  • The historic voice acting lines were transmitted from the ISS and integrated into the 31st episode of ‘Space Brothers,’ airing on November 4.

Background of Space Brothers

Space Brothers was an anime series that not only captures the spirit of space exploration but also breaks new ground by featuring the first-ever voice-over recorded in the vastness of space.

This unique endeavor stars astronaut Akihiko Hoshide, lending his voice from aboard the International Space Station (ISS), where he’s stationed for a four-month mission. The groundbreaking recording session for Space Brothers’ 31st episode took place in mid-September, a collaboration that seamlessly marries the domains of space exploration and entertainment.

The Tsukuba Space Center, acting as the conduit between Hoshide and the anime staff, facilitated this historic moment. Their efforts ensured that Hoshide’s astronaut duties were integrated into the voice acting process, offering viewers a truly authentic experience. This marks a pivotal moment in entertainment, as the first time voice acting lines have been recorded in the infinite backdrop of space.

Through this innovative collaboration, Space Brothers steps into uncharted territory, enhancing its narrative with a touch of real-world astronaut life and setting a new benchmark for what’s achievable in anime storytelling.

Akihiko Hoshide’s Profile

In the vast expanse of space, Akihiko Hoshide, a seasoned Japanese astronaut with JAXA, made history by lending his voice to Space Brothers directly from the International Space Station. His venture into voice acting lines for the anime while orbiting Earth is nothing short of groundbreaking. You’re witnessing an astronaut not just conducting vital experiments but also diving into the world of anime, from space!

Fact Detail
Affiliation JAXA (Japan Aerospace Exploration Agency)
Historic Achievement First to record voice acting lines in space for Space Brothers
Mission Duration Four months on the ISS
Key Experiments Bone density and small-scale satellites
Recording Location Tsukuba Space Center

Hoshide’s dedication shone through as he juggled between his astronaut duties and recording for Space Brothers. He spent months aboard the ISS, not only contributing to scientific understanding through bone density experiments and launching small-scale satellites but also breaking new ground in entertainment. His cameo in Space Brothers, set to air in early November, marks a stellar merge of science and pop culture, immortalizing his voice among the stars.

Preparing for Space Recording

You’re about to commence on a journey where space meets voice acting. Selecting the right equipment was essential, as it had to withstand the challenges of microgravity, ensuring Hoshide could capture every nuance of his performance. His training was no less demanding, tailored to master the art of recording amidst the stars.

Equipment Selection

Selecting the right equipment for space recording is essential, guaranteeing every line delivered is crystal clear, even in the vast expanse of space. Special equipment, tailored for capturing voice acting lines, underwent rigorous selection. Compact and lightweight devices were prioritized to fit the unique ISS environment, where every inch and ounce matter. These tools were engineered to minimize background noise and interference, vital in a place where every sound can echo or distort. Testing was key, verifying their functionality and reliability under microgravity conditions. Collaboration with audio technology experts ensured these recording tools were not just adapted but perfected for space usage, promising an unprecedented clarity and quality in the final voice-over product.

Astronaut Training

In order to guarantee the project’s success, astronaut Akihiko Hoshide underwent intensive voice acting training, tailored for the unique challenges of space recording. This specialized preparation wasn’t just about hitting the right notes or perfecting dramatic pauses; it was an in-depth exploration into mastering voice acting amidst the disorienting backdrop of microgravity conditions. Imagine trying to convey raw emotion or deliver a punchline while floating in a zero-gravity environment—not your average voice acting gig.

Hoshide’s training blended the art of voice acting with the science of space travel. He practiced articulating lines with precision and authenticity, ensuring his performance would resonate, even in the vastness of space. This meticulous preparation bridged the gap between executing space mission tasks and delivering stellar voice acting, ensuring every word recorded in space felt as grounded as those spoken on Earth.

Challenges in Space

the International Space Station pictured from the SpaceX Crew Dragon Endeavour during a fly around of the orbiting lab that took place following its undocking from the Harmony module’s space-facing port on Nov. 8, 2021.
the International Space Station pictured from the SpaceX Crew Dragon Endeavour during a fly around of the orbiting lab that took place following its undocking from the Harmony modules space facing port on Nov 8 2021

You’re in space, where microgravity turns simple tasks into complex challenges, especially when you’re trying to record crystal-clear audio for an anime. Every word you say fights against the constant hum and buzz of spacecraft systems, making clean sound capture a battle. This isn’t just recording; it’s pioneering voice work where silence is as rare as Earth beneath your feet.

Microgravity Recording Hurdles

Recording voice-over in the void of space throws unique challenges at astronauts, demanding innovative solutions to tackle microgravity’s quirks. When Akihiko Hoshide undertook voice acting for Space Brothers aboard the ISS, he faced the peculiar ordeal of ensuring his microphone didn’t float away and combating sound waves’ tendency to scatter in zero gravity.

The absence of gravity meant his vocal cords worked differently, requiring him to alter how he projected his voice. The equipment, too, needed a revamp, tailored to snatch sound accurately in the vast, quiet expanse of space. This extraordinary endeavor between the anime production team and the ISS crew showcases the lengths we’ll go to tell stories.

Challenge Solution
Microphone drifting Secure mounting
Sound wave dissipation Environment adaptations
Vocal cord anomaly Technique adjustment
Recording equipment Microgravity modifications

Spacecraft Noise Interference

After tackling microgravity’s quirks, astronauts also had to confront the relentless hum of spacecraft noise while recording voice-overs for Space Brothers. Astronaut Akihiko Hoshide, amidst the unique recording setup of the International Space Station (ISS), faced several hurdles:

  1. Spacecraft Noise Interference: The constant background noise threatened audio quality.
  2. Unique Recording Setup: Tailoring equipment to counter ISS conditions was essential.
  3. Audio Quality Preservation: Ensuring Hoshide’s voice acting lines were crystal clear.
  4. Combatting Background Noise: Strategies to minimize interference had to be devised.

Despite these obstacles, Hoshide successfully navigated the conditions aboard the ISS, delivering his voice acting lines for the Space Brothers anime with remarkable clarity. The recording process, though fraught with challenges, showcased the ingenuity required to maintain audio quality in space.

Recording Equipment Used

Astronaut Akihiko Hoshide wielded a specialized recording device, provided by the Space Brothers anime staff, designed to thrive in the challenging space environment. This wasn’t just any gadget. The Space Brothers anime team had outdone themselves, equipping Hoshide with a high-quality microphone fine-tuned for the unique acoustics of space environments. Imagine, every word, every breath, captured with crystal clarity, devoid of the muffled echoes typical in such a vast, empty expanse.

Hoshide’s voice acting lines, meticulously prepared, were transmitted from the ISS straight to Earth, marking a milestone in the production process. This wasn’t a simple plug-and-play operation. The anime production team and the crew aboard the ISS had to synchronize watches, making sure that the magic of voice-over recording from space was captured without a hitch.

Specific protocols were the backbone of this interstellar recording session. They guaranteed that the voice’s quality and clarity did not get lost in space. The team on Earth had to be on their toes, ready to receive and integrate these lines, bringing the character to life in a way that was nothing short of groundbreaking.


In an unprecedented leap, Akihiko Hoshide brought ‘Space Brothers’ to life directly from the cosmos. Overcoming the void’s silence, his voice, etched with clarity and passion, was captured through meticulously chosen gear, tailored for the ether’s embrace.


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