Deployable radiator capacity is the binding constraint on orbital data center power scaling as evidenced by Starcloud-2's 'largest commercial deployable radiator ever sent to space' for 100x power increase

Starcloud-2's mission manifest highlights the 'largest commercial deployable radiator ever sent to space' as a key enabling technology for its 100x power generation increase over Starcloud-1. This framing — radiator as headline feature alongside NVIDIA Blackwell GPUs and AWS server blades — reveals that radiator capacity, not compute hardware availability, is the binding constraint on ODC power scaling. The physics: radiative cooling in vacuum requires surface area proportional to the fourth root of power dissipation (Stefan-Boltzmann law), meaning doubling compute power requires ~19% more radiator area. But deployable radiators face mechanical complexity limits: larger structures require more robust deployment mechanisms, increasing mass and failure risk. Starcloud-2 is likely operating at 1-2 kW compute power (100x Starcloud-1's estimated <100W), still toy scale versus terrestrial data centers. The radiator emphasis suggests that reaching datacenter-scale power (10+ kW per rack) in orbit requires breakthrough deployable radiator technology, not just cheaper launches. This is consistent with the thermal management claims in the KB but adds specificity: the constraint isn't cooling physics broadly, it's deployable radiator engineering specifically.