Chile’s Atacama Desert: A Battle Between Astronomy and Industry
"The conditions in the Atacama Desert are unique in the world."
— Chiara Mazzucchelli, president of the Chilean Astronomical Society
The Atacama Desert in Chile, the driest place on Earth, is a world-class hub for astronomy. Its dry climate, high altitude, and isolation from light pollution make it ideal for stargazing. The region hosts nearly 30 astronomical sites, including the renowned Paranal Observatory.
A Recent Victory—And a Warning
In January 2025, a proposed green energy complex near the Paranal Observatory was canceled after appeals from astronomers and scientists. However, experts caution that this victory is fragile. Existing sky preservation laws are lax and outdated, leaving the region vulnerable to future threats.
Why the Atacama is So Important
The Atacama Desert offers over 300 clear nights per year, providing unparalleled conditions for astronomical observation. The European Southern Observatory (ESO) is currently building the Extremely Large Telescope (ELT) nearby, scheduled for completion in 2030. This telescope will be 20 times more powerful than current leading telescopes.
The Threats Are Not New
Despite its pristine reputation, the Atacama faces growing pressure from:
- Urban sprawl
- Industrial development
- Mining operations
- Wind farms
These activities increase light pollution, dust, atmospheric turbulence, and micro-vibrations. A historical precedent exists: the first international heliophysics observatory in Chile was forced to shut down in 1955 due to mining pollution.
Recent Conflicts
In 2024, an energy project was proposed just 10 kilometers from Paranal. It raised serious concerns about:
- Light pollution
- Micro-vibrations
- Dust contamination
- Atmospheric turbulence
The company canceled the project in January 2025, but the underlying regulatory gaps remain unaddressed.
The Stakes for the Future
"The ELT's size would be rendered ineffective if placed near a city."
— Itziar de Gregorio-Monsalvo, ESO representative in Chile
Daniela González, director of the Cielos de Chile Foundation, stated they are working to ensure new criteria are strict enough to protect astronomical areas. Eduardo Unda-Sanzana, director of the Astronomy Center at the University of Antofagasta, warned that without updated regulations, similar projects could be proposed at any moment.
The race to protect Chile's dark skies is far from over. While the cancellation of the energy project is a positive step, the underlying issues of lax regulation and competing industrial interests remain a serious challenge for the future of astronomy in the Atacama Desert.