Why astronomers chose a remote Chilean mountain for the world's largest telescope

The European Southern Observatory selected Cerro Armazones as the home for the European Extremely Large Telescope. This video explains the site selection process for the 40-metre-class telescope, highlighting the geographical factors that make this isolated peak in the Atacama Desert ideal for deep space observation.

On 26 April 2010, the ESO Council officially designated Cerro Armazones as the location for the European Extremely Large Telescope. Situated in Chile's Atacama Desert, the site sits at an altitude of 3046 metres. Its placement is strategic, located approximately 130 kilometres south of Antofagasta and just 20 kilometres from Cerro Paranal, which already hosts the Very Large Telescope.

The choice of this 40-metre-class facility reflects the need for optimal atmospheric conditions for high-resolution astronomy. By building near existing infrastructure like the Very Large Telescope, the project leverages established logistical support while benefiting from the unique, isolated environment of the high-altitude desert.

Source: ESOcast 16: E-ELT Site Chosen