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This ESOcast describes how astronomers have accurately measured the diameter of the faraway dwarf planet Eris for the first time by catching it as it passed in front of a faint star. This event was seen at the end of 2010 by telescopes in Chile, including the TRAPPIST telescope at ESO’s La Silla Observatory. The observations show that Eris is an almost perfect twin of Pluto in size. Eris seems to have a very reflective surface, suggesting that it is covered in ice, probably a frozen atmosphere.
More information: http://www.eso.org/public/videos/eso1142a/
On Saturday 15 October 2011 ESO opened the doors of its headquarters in Garching bei München, Germany, to the public. Throughout the day, thousands of visitors had the chance to help build a full-size mock-up mirror of the European Extremely Large Telescope (E-ELT) -- the largest planned telescope in the world -- and to experience many other aspects of ESO's work.
More information: http://www.eso.org/public/videos/esocast37a/
