Google's first Project Suncatcher prototype satellite is online and communicating with the ground, and the Gemma 4 model loaded onboard has answered its first prompt from orbit. A Google spokesperson said the satellite is operating nominally after roughly three weeks of commissioning.
For the first test, engineers prompted the pre-loaded Google DeepMind Gemma 4 model, which wrote a haiku about being in space. It is a small output, but it confirms that Google's Tensor Processing Units are running a language model in orbit.
The refrigerator-sized prototype, built with satellite operator Planet, launched October 1 on SpaceX's Transporter-18 rideshare mission from Vandenberg Space Force Base, alongside more than 100 other spacecraft. It generates up to 1 kW of electricity.
Key facts
- 01Google's first Project Suncatcher prototype is online, and a Google spokesperson said it is operating nominally.
- 02The onboard Gemma 4 model answered its first prompt after about three weeks of commissioning.
- 03The satellite launched October 1 on SpaceX's Transporter-18 mission and generates up to 1 kW of power.
- 04Heat limits the TPU to short sessions, roughly 15 to 20 minutes at a time.
- 05Google plans two more satellites with advanced TPUs in 2027 to test inter-satellite optical links.
Heat sets the operating rhythm. With no air to carry heat away, the satellite has to radiate it from its surface, so the TPU runs in short bursts. Google said at launch that the model would run for about 15 minutes at a time, and the latest account puts sessions at roughly 20 minutes, which complicates communication between the satellite and the ground.
The test campaign now turns to thermal stress and radiation, including bit flips that can corrupt data without any visible error. Ground tests suggested radiation effects would be minimal for inference but a larger problem for training.
Those ground tests built on Google's earlier proton-beam work on its Trillium TPU. In that testing, high-bandwidth memory was the most sensitive component, showing irregularities only after a cumulative dose of 2 krad(Si), against an expected shielded five-year mission dose of 750 rad(Si).
Google plans two more satellites with advanced TPUs in 2027, designed to generate more power and demonstrate optical links between satellites. Those links are central to the Suncatcher design, which envisions solar-powered constellations of TPU satellites operating as a distributed compute cluster. A bench-scale demonstrator has already reached 800 Gbps each way using a single transceiver pair.
That plan sets Google apart from other orbital compute efforts. Starcloud launched a spacecraft carrying an Nvidia H100 chip last November, and Starcloud and Cowboy Space expect to run inference on individual satellites, while Google is planning high-speed links between satellites for distributed workloads. SpaceX has said it expects to deploy orbital AI compute satellites as early as 2028.
Launch cost is the gating factor. Google's Suncatcher analysis projected launch prices could fall below $200 per kilogram by the mid-2030s, and a peer-reviewed Suncatcher analysis estimated SpaceX would need to fly Starship about 1,800 times to reach the cost reductions it saw with earlier vehicles. Alphabet holds a significant investment stake in SpaceX.
Project lead Travis Beals called the prototype a very minimal test and said he does not expect space data centers to be cheaper than ground-based ones within five years. Google has described Suncatcher as a long-term research initiative rather than a near-term replacement for data centers on Earth.
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