Satellite mirror plans could disrupt sleep and ecosystems worldwide

18 hours ago

Scientific societies representing circadian rhythm researchers express concerns about plans to deploy reflective mirrors and up to 1 million more satellites in low Earth orbit, citing potential disruptions to human health and ecosystems.
Reflect Orbital's proposal involves using reflective satellites to illuminate Earth at night, while SpaceX aims to launch satellites for a solar-powered AI computing network, both potentially increasing night sky brightness and light pollution.
Researchers warn that altering natural light-dark cycles could affect biological clocks, impacting sleep, hormone secretion, migration of nocturnal species, plant cycles, and marine phytoplankton, with ripple effects on food security and ecosystems.
Modeling shows current satellites have already increased diffuse night sky brightness by about 10%, with predictions of further rises by 2035, approaching thresholds set for preserving naturally dark skies.
Scientists urge regulators like the FCC to conduct full environmental reviews, set limits on satellite reflectivity and cumulative brightness, and treat sky alteration with the seriousness of other planetary-scale environmental changes like climate change.

Hasty Briefsbeta