Construction begins on world's largest telescope in Chilean desert

ATACAMA DESERT, Chile (Reuters) - Construction began in Chile on Friday on the European Extremely Large Telescope, which when completed will be the world's largest optical telescope, some five times larger than the top observing instruments in use today.

The size of the ELT has the potential to transform our understanding of the universe, say its backers, with its main mirror that will measure some 43 yards across.

Located on a 3,000 meter-high mountain in the middle of the Atacama desert, it is due to begin operating in 2024.

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Construction begins on world's largest telescope
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Construction begins on world's largest telescope
Chile's President Michelle Bachelet and Director General of the European Southern Observatory (ESO), Tim de Zeeuw walk at the construction site of the world's largest telescope in the desert of Atacama, Chile, May 26, 2017. Sebastian Rodriguez/Courtesy of Chilean Presidency/Handout via Reuters ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY.
Chile's President Michelle Bachelet speaks during a ceremony to inaugurate the construction of the world's largest telescope in the desert of Atacama, Chile, May 26, 2017. Sebastian Rodriguez/Courtesy of Chilean Presidency/Handout via Reuters ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY.
Chile's President Michelle Bachelet and Director General of the European Southern Observatory (ESO) Tim de Zeeuw (L) are seen next to a scale model of the world's largest telescope during a ceremony to inaugurate its construction in the desert of Atacama, Chile, May 26, 2017. Sebastian Rodriguez/Courtesy of Chilean Presidency/Handout via Reuters ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. TPX IMAGES OF THE DAY
Earth’s largest optical & infrared telescope to peer into deep #space with enormous 39-meter wide lens… https://t.co/dTH5DJHeKC
Construction has started on the world's largest optical telescope ... on top of a mountain. https://t.co/V3lfHYUD8c
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Among other capabilities, it will add to and refine astronomers' burgeoning discoveries of planets orbiting other stars, with the ability to find more smaller planets, image larger ones, and possibly characterize their atmospheres, a key step in understanding if life is present.

"What is being raised here is more than a telescope. Here we see one of the greatest examples of the possibilities of science," said Chilean President Michelle Bachelet in a speech to mark the beginning of construction at the site.

The dry atmosphere of the Atacama provides as near perfect observing conditions as it is possible to find on Earth, with some 70 percent of the world's astronomical infrastructure slated to be located in the region by the 2020s.

The ELT is being funded by the European Southern Observatory, an organization consisting of European and southern hemisphere nations. Construction costs were not available but the ESO has said previously that the ELT would cost around $1.12 billion at 2012 prices.

(Reporting by Jorge Vega, Writing by Rosalba O'Brien; editing by Diane Craft)

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