This South American desert is the best place on Earth for winter stargazing

Redatto da valerie

5 November 2025

Far from the glow of city lights, in a landscape so alien it often stands in for other planets in films, lies a destination that offers a perspective-altering view of the cosmos. The Atacama Desert in northern Chile, a place of stark beauty and extreme conditions, holds the title of the driest non-polar desert on Earth. But its true treasure is revealed after sunset. During the Southern Hemisphere’s winter, this remote corner of the world transforms into the planet’s foremost stage for stargazing, offering a celestial spectacle of unparalleled clarity and brilliance that draws scientists and travelers alike to gaze into the depths of the universe.

The Atacama Desert: an Astronomer’s Paradise

A unique geographical location

Stretching for over 1,600 kilometers along the Pacific coast of Chile, the Atacama Desert is a plateau nestled between two mountain ranges: the Andes to the east and the Chilean Coast Range to the west. This unique topography creates a powerful double rain shadow, effectively blocking moisture from both the Pacific and Atlantic oceans. The result is an environment of extreme aridity, with some weather stations in the region having never recorded any rainfall. This lack of moisture, combined with its high average altitude of 2,500 meters, creates atmospheric conditions that are exceptionally stable and transparent, making it a natural window to the stars.

A hub for global science

The world’s astronomical community has long recognized the Atacama’s singular advantages. Consequently, the region has become home to a significant portion of the planet’s most advanced ground-based astronomical infrastructure. International consortiums from Europe, North America, and East Asia have invested billions of dollars to construct next-generation telescopes on its high-altitude peaks. These facilities are not merely observatories; they are sprawling scientific complexes dedicated to unraveling the deepest mysteries of the universe, from the formation of planets to the nature of dark energy. The concentration of cutting-edge technology here makes the Atacama not just a destination for tourists, but a critical nexus for human knowledge and discovery.

The pristine conditions that attract this massive scientific investment are the very same factors that make the Atacama an unforgettable destination for amateur stargazers and curious travelers.

Why Atacama is perfect for stargazing

Unmatched clarity and minimal light pollution

The primary ingredients for exceptional stargazing are dark and clear skies, and the Atacama delivers both in abundance. The region boasts an average of 330 clear nights per year, a figure unrivaled by almost any other location on Earth. Furthermore, its sparse population and vast, undeveloped expanses mean that light pollution is virtually nonexistent. In many parts of the desert, the sky is rated as a Class 1 on the Bortle scale, which represents the darkest sky possible on our planet. This allows the naked eye to perceive celestial phenomena that are completely invisible from urban or suburban areas, such as the zodiacal light and the full, textured expanse of the Milky Way.

The advantage of high altitude

Observing the stars from a high-altitude location is like looking through a cleaner window. At elevations between 2,400 and 5,000 meters, the Atacama’s observatories and viewing spots sit above a significant portion of the Earth’s atmosphere. This thin air has two major benefits:

It contains far less water vapor, which absorbs and scatters starlight, particularly at infrared wavelengths.
It reduces atmospheric turbulence, the phenomenon that causes stars to “twinkle” and blurs telescopic images.

This combination of height and dryness results in a sharper, more stable view of the cosmos, allowing telescopes and even the naked eye to resolve finer details.

Atmospheric stability

Beyond its clarity, the atmosphere above the Atacama is remarkably stable. The cool, offshore Humboldt Current creates a temperature inversion layer, which traps weather and clouds at lower altitudes, leaving the high desert plateau in calm, undisturbed air. This lack of turbulence, known as “good seeing” in astronomical terms, is the holy grail for astronomers. For the casual observer, it means stars appear as sharp, steady points of light, and the view through binoculars or a small telescope is crisp and detailed. The difference in viewing quality is not subtle; it is a dramatic improvement over what is possible in most other parts of the world.

Feature	Atacama Desert	Average Stargazing Location
Clear Nights per Year	Approximately 330	Fewer than 150
Altitude	2,400 to 5,000 meters	Sea level to 1,000 meters
Light Pollution (Bortle Scale)	Class 1 (Excellent dark sky)	Class 4-8 (Suburban to city sky)
Atmospheric Water Vapor	Extremely low	Variable to high

These optimal viewing conditions have naturally led to the construction of some of the world’s most impressive observatories, many of which welcome visitors to share in the discovery.

The best observatories to discover

The ALMA Observatory

The Atacama Large Millimeter/submillimeter Array, or ALMA, is one of the most ambitious astronomical projects on Earth. It is not a single telescope but an array of 66 high-precision antennas working together as one giant, reconfigurable telescope. ALMA doesn’t see visible light; instead, it detects faint radio waves emitted by the coldest objects in the universe, such as the dust and gas clouds where stars and planets are born. While visitors cannot look through the antennas, ALMA offers free public tours on weekends (which must be booked far in advance) that take guests to the Operations Support Facility to learn about the project and see the control rooms where cosmic data is processed.

Paranal Observatory and the VLT

Perched atop Cerro Paranal, the Paranal Observatory is operated by the European Southern Observatory (ESO) and is home to the Very Large Telescope (VLT). The VLT is a collection of four massive 8.2-meter optical telescopes that can work together to form the world’s largest optical interferometer. It has been instrumental in countless major discoveries, including the first image of an exoplanet. Like ALMA, Paranal offers free weekend tours that give the public a chance to see these incredible instruments up close and appreciate the scale of modern astronomical research.

Amateur and tourist-friendly observatories

For those seeking a more hands-on experience, the area around the tourist hub of San Pedro de Atacama is dotted with smaller, private observatories designed specifically for astrotourism. These tours typically take place at night and allow visitors to look through powerful amateur-grade telescopes under the guidance of an expert astronomer. Guides point out constellations, planets, nebulae, and galaxies, often weaving in stories from both modern science and the Andean cosmovision of the indigenous Likanantay people. These experiences make the cosmos accessible and deeply personal.

To maximize the impact of a visit to any of these sites, choosing the right time of year is absolutely essential.

Ideal time for winter stargazing

Why winter is the prime season

The Southern Hemisphere’s winter, from roughly June to September, is considered the best time for stargazing in the Atacama. During these months, the desert air is at its driest and most stable, leading to the clearest possible skies. More importantly, this is when the bright, dense core of our own galaxy, the Milky Way, is positioned high overhead for most of the night. The view is breathtaking: a luminous band of billions of stars, streaked with dark dust lanes, stretching from horizon to horizon. This celestial feature is far more spectacular when viewed from the Southern Hemisphere, and winter provides the best and longest window to observe it.

Navigating the lunar cycle

An equally important timing factor is the phase of the moon. A bright full moon acts like a natural form of light pollution, washing out fainter stars, meteors, and the delicate structure of the Milky Way. To experience the true darkness of the Atacama, it is crucial to plan a visit during the week surrounding the new moon. Checking a lunar calendar should be one of the first steps in planning a trip. The difference between a night with a new moon and one with a full moon is, quite literally, night and day for a stargazer.

With the timing set, the final step is to prepare for the unique demands of a night spent in the high desert.

Preparations and equipment for a night under the stars

Essential clothing and gear

The Atacama Desert is a land of thermal extremes. While daytime temperatures can be pleasant even in winter, they plummet dramatically after sunset, often dropping below freezing. Proper attire is not a suggestion; it is a necessity for comfort and safety. A successful night of stargazing requires:

Layers: A base layer, a fleece or mid-layer, and a warm, windproof outer jacket.
Warm accessories: A winter hat, gloves, and a scarf are essential for retaining body heat.
Sturdy footwear: Closed-toe shoes or hiking boots with warm socks will keep your feet comfortable on the cold ground.

Being cold can quickly ruin the experience, so it is always better to bring more layers than you think you will need.

Stargazing tools for amateurs

While the naked eye is enough to be amazed, a few simple tools can enhance the experience. A good pair of binoculars (7×50 or 10×50 are ideal) can reveal stunning detail, such as the craters of the moon, the moons of Jupiter, and the fuzzy shapes of distant star clusters and nebulae. For navigating the sky, numerous smartphone apps can identify stars, planets, and constellations in real-time. It is also critical to use a flashlight with a red light setting. Red light does not ruin your night vision as much as white light does, allowing your eyes to remain adapted to the darkness.

This careful preparation enables visitors to fully engage with an activity that has become a cornerstone of the region’s identity.

The unique experience of astrotourism in Chile

More than just looking up

Astrotourism in the Atacama is an immersive experience that blends science, nature, and culture. Guided tours often go beyond simply identifying celestial objects. They delve into the physics of stars, the scale of the universe, and our place within it. Many guides also share the rich astronomical traditions of the region’s indigenous peoples, who used the stars for navigation, agriculture, and spiritual guidance. They saw constellations not only in the patterns of stars but also in the dark dust lanes of the Milky Way, perceiving shapes of animals like the llama and the serpent. This dual perspective adds a profound layer of cultural depth to the scientific wonder.

A growing industry

Chile has fully embraced its status as an astronomical capital, officially protecting its dark skies and actively promoting astrotourism. This has led to the development of a sophisticated tourism infrastructure. From specialized “astronomical hotels” with their own observatories to a wide range of tour operators catering to different levels of interest and expertise, the industry is designed to provide high-quality experiences. This commitment ensures that visitors can easily and safely access some of the most spectacular night skies on the planet.

The Atacama Desert provides more than just a beautiful view; it offers a rare opportunity to connect with the universe in a direct and powerful way. The combination of its perfect astronomical conditions, world-class scientific facilities, and rich cultural context makes it an unparalleled destination. A winter night spent under its star-filled sky is a humbling and unforgettable reminder of the vastness of the cosmos and our small but precious place within it.