The Atacama Desert in northern Chile is the driest non-glaciated place on Earth. In some areas, there hasn't been rain for hundreds of years. The landscape here is so inhospitable, red, and lifeless that scientists have called it the "Chilean Mars." Here, NASA and the European Space Agency test rovers, search for extreme life forms, and prepare for the conquest of the Red Planet. Let's understand why the Atacama is so similar to Mars and what we can learn about the Universe without leaving Earth.

Geographic Position and Uniqueness

The Atacama stretches for 1000 km along the Pacific coast of Chile, between the Andes and the Coastal Cordillera. The width of the desert is 100-150 km. Its uniqueness lies in its extreme aridity. In the city of Calama, the average annual rainfall is 5 mm, and in some parts of the desert (such as in the Yarai region), rainfall has not been recorded since people began keeping records. The reason is the "double shadow effect": the Andes block moist air masses from the east (from the Amazon), and the Coastal Cordillera from the west (from the Pacific Ocean). Moreover, the cold Peru Current cools the air near the coast, preventing it from rising and forming clouds. As a result, the Atacama is drier than the Sahara Desert and even the dry valleys of Antarctica.

Landscape: Martian Scenery

Red-orange rocks, salt flats, dunes, dry riverbeds, volcanic cones — all this resembles panoramas captured by rovers. The Valley of the Moon (Valle de la Luna) is particularly famous, where erosion has created bizarre stone formations resembling lunar craters. The Salars de Atacama Salt Lake, with its salt crust and lagoons inhabited by flamingos, seems like an alien oasis. In some places, the soil contains minerals such as gypsum and hematite, which are also found on Mars. It's no wonder that directors choose the Atacama for filming space movies ("2001: A Space Odyssey," "Interstellar," the "Mars" series).

Climate and Life in Conditions Similar to Martian

During the day, the temperature rises to +40°C, and at night falls to -5°C. Ultraviolet radiation is high, the atmosphere is dry, and the soil contains high concentrations of toxic perchlorates (as on Mars). Despite this, life has found its way. Extremophile bacteria inhabit the salt layers and voids in rock formations. Discoveries of these microorganisms inspire astrobiologists: if life can adapt to the conditions of the Atacama, it could exist under the surface of Mars as well. In the 2020s, "microbial mats" were found in dry riverbeds capable of surviving on hygroscopic salt, which absorbs water from the atmosphere.

Scientific Bases and Experiments

It is precisely because of the Martian similarity that several research stations are located in the Atacama. ALMA (Atacama Large Millimeter Array) — the most powerful radio telescope in the world — studies space, not Mars. However, the desert is used for ground tests of rovers. For example, the Curiosity and Perseverance rovers were tested in the Atacama (such as in 2019 when a NASA team tested drilling equipment). The Europeans test life detection systems here. Moreover, there is the "Mars Desert Research Station" project (although it is located in Utah, USA), but there is an equivalent station in the Yarai region, where meteorites are studied and Martian geology is modeled.

What Was Found in the Atacama: The Key to Martian Past

In 2003, a unique site was discovered in the Atacama — the Yarai Valley, where some soils even lack signs of microbial life. This "sterile" zone is close to Martian. Scientists have studied how organic molecules are preserved (or destroyed) under such conditions. It turned out that perchlorates break down organic matter under the action of ultraviolet light, explaining why rovers have difficulty finding signs of life on the Red Planet. Water was also found in salt domes: thin films of water are held in salt crystals at temperatures below zero. This suggests where to look for water on Mars.

Tourism on the "Chilean Mars"

The Atacama is a popular tourist destination. Thousands of people come to the oasis of San Pedro de Atacama to see the El Tatio geysers (height 4300 m), the salt desert, hot springs, and the famous Valley of the Moon. Tourists are forbidden to leave the trails to avoid disrupting the fragile ecosystem, but astrophotographers come to take advantage of the world's best conditions for star gazing. Local guides proudly show the "Martian" landscapes and tell about scientific expeditions. In 2026, the "Martian Track" route was opened — a 50-kilometer hiking route through the most photogenic places.

Atacama and Sustainable Development

Paradox: The Atacama is one of the driest places, but it is here that vast deposits of lithium (necessary for electric vehicle batteries) and copper are located. Mining of useful minerals threatens the unique ecosystem. Moreover, in recent years, floods have occurred in the desert due to climate change (a phenomenon that scientists call "araucarization"). So, the "Chilean Mars" reminds us that Earth is also fragile and that the colonization of another planet should not lead to the destruction of our own.

Future Research: Subterranean Rivers and Life

In 2025, a huge system of subterranean rivers was discovered under the Atacama — a result of the melting of glaciers in the Andes. This has changed the understanding of the water balance of the desert. Astrobiologists now suggest that similar subterranean water bodies may exist on Mars, feeding possible microbial oases. In 2026, the "Atacama-Mars" project began: drilling wells up to 100 meters deep to study deep life. The results will help in choosing sites for future Martian missions.

The Atacama is a unique outdoor laboratory. Studying it, we understand not only the past of Mars but also the future of Earth under global warming. The desert where there is no rain teaches us to value water, look for life in the most desperate places, and prepare for interstellar travel. The "Chilean Mars" is both a warning and a hope at the same time.

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