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The past year has produced some of the most exciting results in the history of astronomy, particularly in the area of planets outside our solar system. Only a halfyear before our meeting in Toledo, Spain, the first unambiguous detection of planetsized masses orbiting main sequence stars were reported. Since that time, evidence for a new exo planet has been reported almost at the rate of about once per month. Some of these objects are likely to turn out to be very lowmass stars, but something like half show characteristics Jupiterlike mass and nearzero orbital eccentricity which appear to be unique to planets. Almost at the same time that giant planets were being discovered regularly, the two major space agencies, ESA and NASA, have iden tified searches for and detailed study of Earthlike planets as a major priority for the future. In ESA's 'Horizon 2000 Plus' programme, an infrared interferometer has been proposed as a possible future Cor nerstone mission. Similarly, scientists in the US produced the 'Road Map for the Exploration of Neighboring Planetary Systems (ExNPS)', which provided NASA with a longterm plan which leads also to an infrared interferometer in space to study hypothetical Earthlike worlds beyond our Solar System. Such an observatory is designed to search for the thermal emission from a family of planets, using interferometric nulling to remove the contaminating light from the central star.
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