Optical pulsations of Crab pulsar (33  ms period).
The optical image of Chandra Galactic ultra deep field (1.5-deg field). Mosaic, pseudocolors are from images in g',r',i'.
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The central part of Coma galaxy cluster.
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The optical image of distant galaxy cluster cl0230+1836 (z=0.80) from 400d X-ray cluster survey.