My Notes by Dr. Khan

World's biggest 'eye on the sky' clears key hurdle

A plan to build the biggest land-based optical telescope in the world has cleared an important hurdle, the European Southern Observatory (ESO) announced.

Two-thirds of ESO's governing council gave full or provisional approval for the so-called European Extremely Large Telescope (E-ELT), which opens the way to starting work on the project, it said in a press release yesterday.

The USD 1.35-billion scheme entails building a telescope with a massive light-catching mirror 39.3 metres wide, several times the size of the biggest optical telescopes today.

It will be sited on Cerro Armazones in northern Chile, close to ESO's existing Paranal Observatory, where the extremely arid conditions and high altitude offer excellent

viewing of the skies.

“This is an excellent outcome and a great day for ESO. We can now move forward on schedule with this giant project,” SO's director general, Tim de Zeeuw, was quoted as saying after the council meeting in Garching, Germany.

If all goes well, the E-ELT would start operations about a decade from now, becoming one of the great astronomical assets of the 21st century alongside a planned radio telescope, the Square Kilometre Array (SKA) set to be build in South Africa and Australia.

“The E-ELT will tackle the biggest scientific challenges of our time, and aim for a number of notable firsts, including tracking down Earth-like planets around other stars in the 'habitable zones' where life could exist - one of the Holy Grails of modern observational astronomy,” ESO said.

ESO, which marks its 50th anniversary, is Europe's biggest international venture in astronomy.

In yesterday's vote, six out of 10 countries gave firm approval and four gave “ad referendum” approval, meaning that they needed an official green light from their governments.

Four other countries said they supported the scheme and were “actively working to wards joining the programme in the near future,” ESO said.

Work on building the E-ELT will start once the “ad referendum” votes are made official and financial commitments are secured for at least 90 percent of the total cost.

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