SpaceX's Starlink network already fields more than 18,000 satellites, but a European Southern Observatory (ESO) study released in July 2026 says the total number of objects planned for low‑Earth orbit could soon exceed 1.7 million.

The study, which examined proposals from both private firms and national space agencies, recommends capping the total at 100,000 satellites that are faint enough to stay invisible to the naked eye. Anything brighter, it warns, would turn the night sky into a string of artificial "stars", erasing the Milky Way for most Europeans.

Light pollution already on the rise

Europe's night sky is already dimming under the weight of streetlights, advertising signs and vehicle headlights. A 2023 analysis of artificial sky luminance found that light pollution has been growing at almost 10 % per year between 2011 and 2022. By 2016, six in ten Europeans could no longer see the Milky Way, and the trend is expected to continue.

In a dark rural location, an unaided eye can still pick out roughly 4,500 stars, but in a typical city the figure drops to a few dozen. The loss of visible stars is not just an aesthetic issue; it affects tourism in regions that market stargazing, hampers scientific outreach, and deprives children of a natural classroom.

Satellites adding to the glow

When the first Starlink batch crossed Britain's sky in 2019, many observers mistook the bright moving points for meteors. The satellites are illuminated by the Sun even after it has set for observers on the ground, making them visible to the naked eye on clear evenings. The brightest of the planned constellations could shine as brightly as Venus, according to the ESO report.

Beyond SpaceX, other firms are filing ambitious plans. Reflect Orbital is developing mirrors that would reflect sunlight back to Earth at night, effectively creating artificial daylight. SpaceX itself has asked U.S. regulators for permission to launch up to a million additional satellites to support AI services from orbit.

These projects would dramatically increase the number of reflective objects in low‑Earth orbit, compounding the problem of sky brightening. The ESO's modelling suggests that in heavily lit cities such as Munich, the brightest satellites could become the only visible points of light, eclipsing the natural star field.

What the scientific community says

European astronomers stress that the loss of dark skies would have "devastating consequences for astronomy". Ground‑based observatories rely on natural darkness to detect faint celestial objects; an overabundance of bright satellites would raise background light levels and interfere with long‑exposure imaging.

"We are facing a situation where the very tools we use to explore the universe could be drowned out by our own technological ambitions," said Dr Maria Keller, a senior researcher at the ESO. "If the sky becomes a highway of shining objects, future generations will lose a fundamental part of their cultural heritage."

Industry and regulators respond

SpaceX argues that its constellation provides essential broadband to remote communities, reducing the digital divide across Europe and beyond. The company points to the economic benefits of faster internet for rural businesses, schools and health services.

Reflect Orbital's CEO, James Liu, claims the night‑time illumination project could lower energy consumption by reducing the need for street lighting in sparsely populated areas. "We are not adding light pollution; we are redirecting existing sunlight," he said.

European regulators have yet to adopt a unified policy on satellite constellations. The European Commission's Space Strategy, published in 2024, calls for sustainable use of outer space but stops short of imposing numerical limits. National authorities in France and Germany have begun consultations with industry to develop guidelines that balance connectivity goals with environmental concerns.

What can citizens do?

For now, the easiest way to distinguish a satellite from a star is to watch its motion. Stars remain fixed and twinkle, while satellites glide steadily across the sky and disappear within minutes, usually an hour after sunset or before dawn when they catch reflected sunlight.

Public campaigns across Europe are urging people to report bright satellite passes to astronomy societies, helping researchers track and model their impact. Meanwhile, environmental groups are lobbying the European Parliament for stricter limits on the number of visible satellites.

As the race to populate low‑Earth orbit accelerates, the balance between connectivity, scientific discovery and cultural heritage hangs in the balance. The night sky, a shared European treasure, may soon be decided not by natural forces but by the choices of regulators and corporations.