Google's Suncatcher prototype space data center is now online and communicating with the ground, the company confirmed, after launching earlier this month with more than 100 other spacecraft aboard a SpaceX Falcon 9 rocket. The satellite carries four Google Tensor Processing Units and generates up to 1 kW of electricity. Google said the spacecraft is operating nominally.
The hardware is meant to lay groundwork for future networks of closely flying satellites that would run large inference workloads in orbit. Power constraints limit the satellite to running one TPU at a time, for roughly 20 minutes per session, which complicates space-to-ground communications.
After a commissioning process of about three weeks testing the satellite's subsystems, engineers sent their first prompt this week. They asked Gemma 4, the Google DeepMind model pre-loaded onto the spacecraft, to compose a haiku about being in space, and the model produced a three-line verse. Google said it also tested the model with space-themed limericks and, more importantly, had the spacecraft report on orbital conditions around the satellite.
The continuing test campaign will examine how the chips hold up under thermal stress and in the space radiation environment. Google has tested its TPUs extensively in particle accelerators on Earth, but the company now needs to observe how radiation's real effects in space influence the processors. Radiation can cause bit flips in stored values, corrupting data without setting off typical monitoring tools. Ground testing suggested radiation would have minimal impact on inference workloads and pose more of a problem for model training, and the Google team will now assess those dynamics in reality rather than simulation.
If the onboard TPUs prove capable, Google's next step is launching two more satellites equipped with the advanced chips in 2027, supporting higher power generation and demonstrating inter-satellite optical links. The Suncatcher project is largely alone among space data center visions in planning high-speed links between satellites to support coherent distributed workloads. SpaceX's data centers are also expected to use laser links but to orbit too far apart to share processing effectively, while Starcloud and Cowboy Space expect to perform inference loads on individual satellites.
Google and SpaceX's visions are closely linked: Alphabet, Google's parent company, holds a significant investment stake in SpaceX, and both companies will require Starship to be fully and rapidly reusable to launch their orbital data centers. In a peer-reviewed analysis published earlier this month, Suncatcher researchers estimated SpaceX would need 1,800 Starship flights to match the learning-driven cost reductions of its earlier vehicles. Suncatcher is a classic Google moonshot aimed at infrastructure that will be economical in the 2030s, though Alphabet's stock plunged this week after the company reported that inserting AI into its search businesses is hurting ad revenue growth.
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