Google announces the first response from its Suncatcher prototype in orbit
· BehindLines newsroom · Updated
On 30 October, Google announced the first response from its Suncatcher prototype in orbit. The satellite itself was launched on 1 October: only the announcement of the result is recent.
What Google announced
In a post dated 30 October, Travis Beals, senior director of the "Paradigms of Intelligence" team, explains that the Project Suncatcher prototype has finished its commissioning phase after launch. Teams powered up the host computer and the TPU trays, then ran first machine-learning tests. According to Google, the "Hello World" milestone was reached during a ground-station pass: a prompt was sent to the onboard open model Gemma 4, asking it to write a haiku about space. The poem came back to Earth as the satellite flew over Svalbard, Norway. The team then tested space-themed limericks and prompts asking for the technical status of the payload.
Context: a research project, not a service
The prototype left on 1 October on SpaceX's Transporter-18 rideshare mission from Vandenberg, California, in partnership with Planet. According to the GCN website, the satellite carries four Trillium-generation TPUs, powered by solar panels of about one kilowatt and cooled by heat pipes and radiators because there is no air in a vacuum. GCN also says it runs in sequences of about fifteen minutes, with a thermal shutdown to cool down afterwards. These details do not appear in Google's post; GCN also mentions Gemini models, whereas Google refers to Gemma 4. We therefore keep Google's version for the model.
The aim is to assess whether the abundant solar energy available in orbit could one day power large-scale computing. No commercial timetable has been announced, according to GCN.
A symbolic success, with technical questions
The Register, which published an account on 31 October, puts the test in perspective: a haiku of about twenty tokens would cost roughly $0.000012 through Google Cloud's API, which shows that the cost of the demonstration lies mainly in the hardware and the launch. The outlet estimates the satellite's mass at about 500 kilograms, an extrapolation from the mass of Starlink satellites rather than a confirmed figure.
The same article reports elements drawn from Google's work on radiation. The high-bandwidth memory showed irregularities after a cumulative dose of 2 krad(Si), about three times the minimum requirement of 750 rad(Si) set by Google. The researchers note one silent data corruption roughly every 17 rad; with an estimated orbital dose of 150 rad(Si) per year, Google estimates, according to The Register, about one failure per three million inferences, at one inference per second. According to Google's researchers, this rate is "likely acceptable for inference", while the effect on training and the effectiveness of mitigations "requires further study".
On the economics, Google calculates that launch costs would need to fall to around $200 per kilogram to compete with the electricity of terrestrial data centers, a level the company considers reachable by SpaceX around 2035, The Register reports.
What comes next
Google first plans thermal and radiation endurance tests in orbit, then, in 2027, two satellites linked by lasers. A larger constellation remains a prospect, not a commitment: this first exchange shows that a chip of this kind can answer from orbit, not that it will work there durably.