Stunning Space Photo of the Day: Giant Telescope Mirror Gets a Sparkling Clean | June 17, 2025

Big telescopes have some of the best mirrors in the world. But when they get dirty, what happens?

The European Southern Observatory (ESO) runs powerful telescopes that help astronomers explore our universe. Founded in 1962 by 16 countries, ESO has become a key player in astronomy, focusing on everything from black holes to distant galaxies.

Located primarily in the Atacama Desert in Chile, ESO’s four main telescopes aid in studying cosmic phenomena. The very dry conditions there are perfect for astronomy, allowing clearer views of space.

Among these telescopes is La Silla, which specializes in finding exoplanets. It uses two high-precision telescopes—one measuring 11.5 feet (3.5 meters) and another at 11.8 feet (3.6 meters). Their technologically advanced mirrors capture intricate details from far-off celestial bodies.

Cleaning these mirrors is crucial. Staff at La Silla meticulously strip the old aluminum coating before rinsing the mirrors with demineralized water. After that, the mirrors enter a vacuum chamber where a new layer of aluminum is applied—so thin it’s less than the width of a human hair. If even a slight imperfection occurs, it can impact the data collected from space.

Experts note that maintaining these mirrors is vital not only for data accuracy but for advancing our understanding of the universe. Recent studies show that the search for exoplanets has accelerated in recent years, with thousands discovered thanks to improved technology and techniques.

Interestingly, social media users often discuss the significance of these discoveries, sparking curiosity about the universe beyond our planet. Tagging posts about exoplanets can generate thousands of interactions, indicating a strong public interest in space exploration.

If you’re eager to dive deeper into astronomy and the exciting discoveries made by ESO, check out their official website for more information. They continually share updates about their telescopes and ongoing research.

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