Monday, September 30, 2019: In the remote Chilean Atacama Desert, the European Southern Observatory is laying the foundation for what will soon be the largest ground-based telescope in the world. Named the Extremely Large Telescope (ELT) will have a primary mirror that measures 129 feet (39.3 meters) in diameter, a 14-foot (4.2 m) secondary mirror and a 12-foot (3.75 m). Workers are currently building the foundation for the enormous observatory, which will have a dome-shaped enclosure measuring 243 feet (74 m) tall. — Hanneke Weitering
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