Atacama Desert, Chile

Light pollution is threatening the Atacama Desert’s clear skies, affecting major astronomical projects such as the Extremely Large Telescope. The issue is currently relevant due to rising urban and industrial expansion near key observatories.

Atacama Desert and Light Pollution:

Dimension	Key Details
Light Pollution	Light pollution is the excessive, misdirected, or inappropriate use of artificial light that disrupts natural night environments and causes sky glow.
Location	The Atacama Desert is located in northern Chile and stretches approximately 1,600 km along the Pacific coast.
Boundaries	The desert is bounded by the Pacific Ocean and Coastal Range in the west, Andes Mountains in the east, Peru in the north, and the Chilean Matorral region in the south.
Uniqueness	The Atacama Desert is the driest nonpolar desert on Earth, with some areas having no recorded rainfall due to the rain shadow effect of the Andes Mountains.
Physical Features	The desert comprises Mars-like landscapes, salt flats, volcanoes, and exceptionally clear night skies.
Astronomical Advantage	The desert provides high altitude above 3,000 m, dry climate, isolation from urban light, and more than 300 clear nights annually.
Global Importance	The Atacama Desert acts as a global hub for ground-based astronomy and hosts major astronomical infrastructure.
Major Observatories	Major observatories comprise Paranal Observatory and the forthcoming Extremely Large Telescope.
Paranal Observatory	Paranal Observatory is operated by the European Southern Observatory.
Photon Valley Corridor	The Photon Valley Corridor is a high-altitude corridor in Chile where multiple observatories operate with advanced astronomical instruments.
Scientific Importance	The desert provides conditions for research into the origins of the universe with visibility sharper than NASA’s Hubble.
Emerging Threats	Emerging threats comprise urban expansion, mining, wind farms, and artificial lighting from industrial growth.
Energy Project	A proposed green power complex near Paranal Observatory has been cancelled in January 2026 after appeals by astronomers.
Regulatory Review	Chile’s science ministry is reviewing environmental regulations due to outdated sky-preservation laws.