"Ground-based and s suffer from sources of image quality degradation that typically preclude achieving the . For đˇ=10 m class telescopes at optical wavelengths (đ âź500), the typical achieved of around 1 for a celestial (absent correction) is about 100 times worse than the diffraction limit. A variety of factors contribute to this image degradation, including: ⢠index of refraction variations in the , ⢠âground layerâ or âboundary layerâ due to the boundary condition of zero wind velocity at the Earthâs surface, ⢠perturbations to due to local topography and structures, ⢠turbulence within the enclosure, due to ambient and driven airflow through the slit and vents in the dome, ⢠thermally driven air currents due to power dissipation on the telescope top end, and other locations, ⢠turbulence and thermal currents in the vicinity of the primary mirror due to temperature differences between the mirror and the adjacent air, ⢠tracking errors and vibrations in the , ⢠wind-driven oscillations and motions of the mirror support systems, and ⢠quasi-static s in the optical system."
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Christopher Stubbs
(born March 12, 1958) is an American , known for his research on , cosmology, and gravitation. He was elected in 1999 a Fellow of the . He was a member of the ; the team shared in 2007, with others, the and shared in 2015, with others, the .
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