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Arizona Art by Stephen astronomers atmosphere axis beam bright building built called Caltech Cassegrain celestial objects celestial sphere charge-coupled device chromatic aberration color concave convective cells convex curvature device diameter distance distortion doublet Earth electromagnetic electrons emulsions equatorial mount European Southern Observatory example exposure eyepiece faint field of view focal length focused galaxies Galileo glass grinding Gunn Hale Telescope Herschel inches instrument Janesick Keck Telescope Kepler lens lenses light-gathering power measured metal meters Milky mirror blank Moon Mount Wilson nebula observer optical optician Palomar Palomar Observatory paraboloid photographic plate photons pixels planets polishing primary mirror prime focus produced quasar radiation rays reflecting telescope reflector refracting refractor resolution revealed right ascension rotation Schmidt scientists secondary mirror segments shape speckle image specklegram spherical aberration spin-cast stars supernova surface technique tele telescope tube telescope's temperature Tycho University wave wavefront wavelengths Yerkes