Google’s First Data Center Satellite Is Online, But Power Limits TPU Runtime to ~20 Minutes
Google’s Suncatcher prototype satellite has entered orbit and successfully runs Gemma 4, but total power generation of 1 kW restricts each TPU to about 20 minutes of operation at a time.
Google’s first prototype space data center satellite, part of the “Suncatcher” project, launched earlier this month aboard a SpaceX Falcon 9 rocket and is now online and communicating with ground stations. The spacecraft carries four Google Tensor Processing Units (TPUs) and is designed to test the feasibility of performing large-scale AI inference workloads in orbit.
Power availability remains the primary constraint. The satellite generates up to 1 kW of electricity, but the high energy demands of the TPUs mean that only one can be activated at a time, and even then, for approximately 20 minutes per session. This limitation complicates the already challenging process of space-to-ground communications, as satellites have limited windows to connect with terrestrial antennas.
After a three-week commissioning process, engineers sent their first prompt to the pre-loaded Google DeepMind Gemma 4 model, asking it to write a haiku about being in space to verify the inference pipeline. Beyond functional testing, the campaign will assess how the chips perform under thermal stress and real-world space radiation. While ground simulations suggested minimal impact on inference tasks, actual orbital conditions could cause “bit flips” in memory, potentially corrupting data without triggering standard monitoring alerts.
If the TPUs prove capable in this environment, Google plans to launch two additional satellites equipped with advanced chips in 2027. These follow-up missions aim to demonstrate higher power generation and inter-satellite optical links. The project represents a long-term infrastructure bet for the 2030s, closely linked to Alphabet’s broader AI strategy and its investment stake in SpaceX.