Extremely Large Telescopes are considered worldwide as one of the highest priorities in ground-based astronomy.

They will vastly advance astrophysical knowledge, allowing detailed studies of subjects including planets around other stars, the first objects in the Universe, super-massive black holes, and the nature and distribution of the dark matter and dark energy which dominate the Universe.

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Since 2005 ESO has been working with its community and industry to develop an extremely large optical/infrared telescopes.

Dubbed ELT for Extremely Large Telescope, this revolutionary new ground-based telescope concept will have a 39-metre main mirror and will be the largest optical/near-infrared telescope in the world: “the world’s biggest eye on the sky”.

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General purpose extremely large aperture optical/infrared telescope. Stars form in dense clouds of the interstellar medium, but even in these densest regions the pressure is comparable to the most tenuous vacuum created in a laboratory on Earth.