Google puts a prototype Project Suncatcher satellite into orbit

Google confirmed that a prototype satellite for Project Suncatcher, its research effort exploring whether solar-powered satellites could one day run machine-learning workloads in space, had reached orbit and was operating as expected. The satellite launched on 1 October aboard a SpaceX Falcon 9 rocket as part of the Transporter-18 rideshare mission from Vandenberg Space Force Base, and Google said it would spend the following weeks gathering data on how the hardware withstood the stress of launch and the radiation and thermal extremes of spaceflight.

Built with Planet, the satellite carries four Trillium-generation TPUs — an older Google TPU generation than the company’s current Ironwood chips — in a roughly 650km dawn-dusk sun-synchronous orbit, where solar panels generating about one kilowatt of power run the chips on short Gemini inference queries in bursts of around 15 minutes before the satellite must halt computation to let its radiators shed accumulated heat, according to Google and reporting on the mission.

Google had first described Project Suncatcher in November 2025 as a longer-term bet that satellites linked by free-space optical communication, drawing on far more consistent sunlight than ground-based solar panels, could eventually host large-scale compute clusters without the energy and water demands of terrestrial data centres. The October launch was the project’s first physical test rather than a working cluster: Google said its peer-reviewed research behind the mission had been published in the journal Joule, and that it planned to share further findings as the mission continued.