Google plans to test Tensor Processing Units (TPUs) in orbit with a prototype satellite for Project Suncatcher, a research effort exploring machine-learning infrastructure in space. SpaceX lists Oct. 1, 2026, as the target date for Transporter-18, the rideshare mission planned to carry the prototype. Google identifies Planet as its partner. The test is intended to gather data on launch stress, radiation and thermal conditions.
What the orbital prototype was meant to investigate
Google describes the mission as an early engineering test within a longer-term effort to explore whether low Earth orbit could support scalable machine-learning infrastructure. The prototype is meant to collect data and help identify potential failure points.
Google also cites near-constant sunlight in low Earth orbit as a possible advantage. The company estimates that satellites there could generate up to eight times more solar power than on Earth.
Ground tests targeted vibration and radiation
In its Sept. 24, 2026, update, Google described ground tests that preceded the planned orbital mission. For vibration testing, engineers shook the satellite prototype along all three axes at frequencies intended to mimic launch conditions.
Google also reported exposing Trillium TPUs to a proton beam at UC Davis’s Crocker Nuclear Laboratory while running AI workloads and monitoring for errors such as bit flips. The company said initial results from this ground test showed the TPUs withstood a total ionizing dose greater than the dose expected over a five-year space mission.
Cooling chips in orbit
A vacuum has no airflow to carry heat away, so spacecraft need another way to shed heat. Google says it is developing heat pipes and radiators and has tested the cooling technology in a thermal-vacuum chamber. Evaluating the system in orbit was part of the planned mission’s research objectives.
Google’s planned laser-link test
Google plans to put two satellites in orbit in 2027 to test high-bandwidth laser communications between them.
