Construction for the world's largest telescope begins
The construction of the world's largest optical and infrared telescope has begun in Chile's Atacama Desert. Named Extremely Large Telescope (ELT), it will have a 39-metre-diameter primary mirror housed in an 85-metre rotating dome weighing 5,000 tonnes. ELT will gather 100 million times more light than the human eye to observe Universe's first galaxies and search for "Earth 2.0".