Google’s Project Suncatcher prototype was reported to have lifted off from California aboard a SpaceX rocket on October 1, 2026. Built by Planet Labs on a standard satellite platform, it carries one Google Tensor Processing Unit (TPU), a processor designed for machine-learning workloads. The test is intended to investigate how computing hardware operates in orbit, including its power and thermal-management needs. The launch follows NeoTeo’s earlier preview of the planned Project Suncatcher test.
What Project Suncatcher is testing
The prototype is a research test satellite. Its described test design calls for one kilowatt of continuous power, with the TPU intended to run in 15-minute bursts after commissioning. Those operating periods are part of the test design, alongside the challenge of keeping computing hardware within its thermal limits.
On Earth, cooling systems can move air across hot components. Space has no air for that kind of heat transfer, so spacecraft must shed heat through radiation. Google’s proposed approach uses heat pipes and pumped-fluid loops to carry heat from the hardware to radiators. Engineers also tested thermal systems in a thermal-vacuum chamber before launch.
From a prototype to a proposed satellite network
Google’s longer-term Project Suncatcher design envisions solar-powered satellites carrying TPUs and exchanging data over optical links—communications that use laser light. An illustrative model uses 81 satellites, with a mean altitude of 650 kilometers and a cluster radius of one kilometer.
Google Research has also reported a bench-scale optical-link demonstration using one transceiver pair. It reached 800 gigabits per second in each direction, or 1.6 terabits per second of total bidirectional throughput. That result came from a laboratory test; the optical links are intended for the proposed satellite network.
The next planned milestone is a two-satellite demonstration in 2027, intended to test optical links between spacecraft.
