... The collecting area is increased by nesting concentric mirror pairs, all having the same focal length. ... Figure shows the largest optical element being ground at HDOS. ... X-ray testing demonstrated that the CXO mirrors are indeed the largest high-resolution X-ray optics ever made; the nominal effective area (based on the ground calibrations) is shown as a function of energy in the left panel of Figure , along with those of their Einstein and ROSAT predecessors. ...

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arxiv:0811.2606 Прямое изображение нескольких планет, вращающихся вокруг звезды HR 8799 (Direct imaging of multiple planets orbiting the star HR 8799) . ... Authors: Paul Kalas et al. каталог arxiv:0811.0804 Каталог точечных рентгеновских источников в 383 близких галактиках по данным Чандра (Chandra Acis Survey of X-ray point sources in 383 nearby galaxies I. the source catalogue) . ... обзор arxiv:0811.0487 Потеря массы массивными горячими звездами (Mass loss from hot massive stars) . ...