Image: Adaptive optics
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Description: If your image suffers from time-varying distortions (e.g. due to the atmosphere fluctuations when you do ground-based astronomy) you can use a wavefront sensor to measure them on a spot you know the shape of ("guide star"), and then correct for them using a deformable mirror.
Title: Adaptive optics
Credit: https://twitter.com/j_bertolotti/status/1144525775242182658
Author: Jacopo Bertolotti
Permission: https://twitter.com/j_bertolotti/status/1030470604418428929
Usage Terms: Creative Commons Zero, Public Domain Dedication
License: CC0
License Link: http://creativecommons.org/publicdomain/zero/1.0/deed.en
Attribution Required?: No
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