1.7 Million Satellites Will Have ‘Devastating Consequences,’ Study Says
Proposed satellite constellations from SpaceX and others are so large and bright they would change the night sky as we know it, a new scientific paper argues.
Jamie Carter, Senior Contributor
Forbes
2 min read
8/10
Key Takeaways
The study projects 1.7 million satellites in megaconstellations by 2030, up from roughly 10,000 active satellites today.
Median night-sky brightness could increase by 10% globally, with localized increases of over 30% near dense orbital paths.
Hubble Space Telescope twilight images show satellite streaks in 30% of exposures; ground-based observatories face similar disruption.
SpaceX's Starlink alone has authorization for 42,000 satellites; Amazon's Project Kuiper plans 3,236; China's GuoWang aims for 12,992.
Current mitigation methods — such as special coatings and solar-visor shades — reduce brightness by only up to 50%, insufficient to prevent long-term astronomical impact.
HOOK: The night sky as humanity has known it for millennia could be permanently altered by a single corporate race to space — and a new study puts a staggering number on the threat. LEAD: A peer-reviewed paper published in the journal *Astronomy & Astrophysics* warns that planned satellite constellations from SpaceX, Amazon, and other operators could total 1.7 million satellites by the end of the decade, causing “devastating consequences” for ground-based astronomy, cultural heritage, and the natural nighttime environment. CONTEXT: SpaceX’s Starlink already operates over 6,000 satellites in low Earth orbit, with tens of thousands more authorized. Competitors like Amazon’s Project Kuiper, China’s GuoWang, and the European Union’s IRIS² are rushing to build their own megaconstellations to deliver global broadband. The new study models the cumulative brightness and reflective glare of these planned networks, concluding that the combined effect would make the night sky effectively unrecognizable. KEY DETAILS: Led by researchers at the University of Colorado Boulder, the study calculates that the median brightness of the night sky could increase by as much as 10% worldwide, with far higher spikes near densely populated satellite corridors. Astronomers report that up to 30% of Hubble Space Telescope images taken during twilight are already compromised by satellite streaks. The International Astronomical Union has issued urgent warnings, and the U.S. Federal Communications Commission is under growing pressure to impose brightness limits before approving new licenses. ANALYSIS: The stakes extend beyond science. “The night sky is a shared natural resource, like clean air or fresh water,” said Dr. Mia de los Reyes, an astrophysicist at Amherst College not involved in the study. “If we lose it, we lose a part of human culture that has inspired art, navigation, and wonder for every civilization.” The paper notes that mitigation strategies — such as SpaceX’s experimental darkening coatings — reduce brightness by only about 50%, far from enough to avoid long-term damage. OUTLOOK: The authors call for immediate international regulation of satellite brightness and density, including a cap on total orbital reflectivity. The United Nations Committee on the Peaceful Uses of Outer Space will take up the issue at its next session in 2027. Without action, the study predicts that by 2035, only the most powerful telescopes in remote deserts will escape the artificial glow, and the naked-eye experience of a star-filled sky will become a memory for most of the world’s population.
Frequently Asked Questions
A new peer-reviewed study estimates that planned satellite constellations from SpaceX, Amazon, China, and others could total 1.7 million satellites by 2030, up from about 10,000 currently in orbit.
The combined brightness of tens of thousands of satellites in low Earth orbit will increase the night sky's median brightness by up to 10%, interfering with telescopes and spoiling dark-sky observations. Hubble images already show satellite streaks in 30% of twilight exposures.
Mitigation options include applying dark coatings, adding sunshades, and orienting satellites to minimize reflection. However, the study finds current methods reduce brightness by only about 50%, not enough to fully protect astronomy. International regulation of orbital reflectivity is being discussed at the UN.
SpaceX's Starlink is the largest, with over 6,000 satellites launched and authorization for 42,000. Amazon's Project Kuiper plans 3,236 satellites, China's GuoWang constellation aims for 12,992, and the European Union's IRIS² will add around 290.
Yes. In many parts of the world, the artificial glow from thousands of satellites will make it harder to see fainter stars and the Milky Way with the naked eye. The study warns that the experience of a dark, star-filled sky could become a memory for most people outside remote areas.
