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[Chicago Astronomer - Astro Joe]

Extremely Large Telescope Takes the Next Step

Bigger is better. When you're making a telescope, you want to construct the biggest mirror you can. The European consortium building the Extremely Large Telescope (ELT) - a monster observatory with a main mirror that will be between 50-100 metres - moved a step closer to building their telescope today by releasing the scientific case. If development moves forward, the ELT could begin construction within a few years, and be complete by 2015. Where Hubble can resolve objects 95 m (311 feet) apart on the Moon, the ELT could resolve objects 2 m (6.5 feet) apart.

More here: www.universetoday.com/am/publish/extremely_large_telescope_step.html?772005
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Well ok now. Apollo sites...here we come!

[Maddad]

That range of 50 to 100 meters for the diameter of the scope is huge. I could understand if they were unsure of the size to a few centimeters, but this means that they've got no concrete idea at all yet.