Amazon’s satellite unit, Amazon Leo, and satellite operator Viasat have urged the US Federal Communications Commission (FCC) to reject a proposal by SpaceX to deploy up to one million Starlink satellites.

In a letter to the regulator, Amazon Leo argued that the plan is largely speculative and lacks the technical detail required for a credible regulatory filing. The company said deploying a constellation of that size would take centuries even if all global launch capacity were dedicated to the effort.

“The application seems to describe a lofty ambition rather than a real plan,” Amazon Leo said, warning that the filing appears more like a “speculative placeholder” than a complete proposal.

SpaceX has suggested that an ultra-large satellite constellation could eventually support space-based computing capable of processing AI workloads in orbit, potentially reducing reliance on energy-intensive terrestrial data centers.

Critics, however, say the proposal raises significant concerns about orbital congestion and the monopolization of limited space resources. Amazon Leo noted that maintaining a million-satellite constellation would require replacing about 200,000 satellites every year, far exceeding current global launch capacity.

Astronomers and environmental groups have also raised objections, warning that expanding satellite constellations could worsen light pollution and affect astronomical observation.The dispute reflects a growing battle over control of low-Earth orbit, as satellite networks increasingly become a critical layer of global digital infrastructure alongside fiber networks, cloud platforms, and terrestrial data centers.