The race to build in space could come at a cost to Earth

The rapid expansion of satellite networks and proposed orbital data centers is raising concerns among astronomers about growing light pollution and the future of ground-based space research, The Wall Street Journal reports. 

The newly opened Vera C. Rubin Observatory in Chile, an $800 million U.S.-taxpayer-funded project designed to create the most comprehensive survey of the universe, is already encountering interference from satellites that leave bright streaks across its images. 

More than 17,000 active satellites currently orbit Earth, up from roughly 1,000 a decade ago, and astrophysicists estimate that number could exceed 100,000 within another decade. SpaceX operates approximately 11,000 satellites and has proposed launching up to 1 million additional satellites, while companies including Google, Blue Origin and Cowboy Space plan to develop orbital data centers that could require hundreds of thousands more. 

Some proposed networks would use larger, sun-synchronous satellites that remain illuminated for much of their orbits, reflecting substantial amounts of sunlight toward Earth. Researchers warn that these constellations could create bright bands across the night sky, obscure stars and potentially overwhelm views of the Milky Way. 

The growing satellite presence also threatens scientific research by interfering with telescope observations and increasing overall sky brightness. Although SpaceX has voluntarily taken steps to reduce satellite brightness and some companies have discussed mitigation efforts with astronomers, regulations governing satellite visibility remain limited. 

The Federal Communications Commission approves satellite projects but has no specific brightness standards. Scientists warn that expanding commercial activity in space could undermine astronomical research and fundamentally change humanity’s view of the night sky.

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