E-ELT construction work begins

Building work on ESO's E-ELT, the world’s largest telescope, begins this week

The Cerro Armazones mountain in Chile is the intended site for the E-ELT. Credit: ESO
Published: June 15, 2014 at 12:00 pm

Construction of the world’s largest telescope will start with a bang this Thursday. The European Extremely Large Telescope (E-ELT) will be a massive 39m telescope built by the European Southern Observatory (ESO) in Chile’s Atacama desert.


Demolition crews have already set explosives to blast the top off the Cerro Armazones mountain in Chile where the observatory will be built.

Once finished the telescope will be able to directly image exoplanets, possibly Earth-like ones, and will also be able to detect the earliest galaxies in our Universe.

In order to house the telescope a huge dome needs to be constructed but before building work can even begin, the crew must first level out the top of the mountain.

“We need to remove 70m from the top of the mountain to achieve the minimum size of the flat platform to host the telescope and its dome,” says Roberto Tamai, programme manager for the E-ELT.

“The real work started a couple of weeks ago, with bulldozers on top.

Before they do the blasting we needed to remove the first layer of ground and get rid of all the loose pieces before we reach the real rock.”

After the first blast on Thursday there will be several more before the site is ready.

All going well, the telescope's foundations will be laid by 2017.

However it will still be another 10 years before the project is finished, as both the telescope and dome require a huge amount of precision engineering.

The primary mirror is so large, over 39-metres in diameter, that it’s not possible to build it in one piece. Instead the mirror will be made of 798 hexagonal segments.

To get it ready for the 2024 deadline, researchers around the world have already begun testing the technology needed to build the massive telescope.

“We’ve been building some of the science equipment, mostly prototypes of things like the primary mirror segments, the supports and some of the secondary mirrors,” says Tamai.

“The biggest challenge in terms of engineering is the precision requested for something this size.


We’ve tested most of the components, but what’s left is to put them together on such a big machine.”


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