... Telescopes and Observatories . ... Have you ever heard of the European Southern Observatory ? ... When I first heard about the ESO, I thought it was similar to our very own Armagh Observatory and based in one place. ... It boasts a 3.5-metre тАЬNew Technology Telescope тАЭ which was the first telescope in the world to have a computer-controlled main mirror, a technology which was developed at the ESO and now applied to most of the world?s current large telescopes . ... Image credit: ESO) . ...