Assertion: newtonian telescope's mirror | /r/Desires | regular re-alignment
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text: Mirrors may need regular re-alignment as they can easily slip out of alignment due to knocks and bumps or even the temperature changes, They can be susceptible to the spherical aberrations which can interfere with the image quality unless the mirrors and other optics are kept at the same temperature as the outside air , There will be the air currents inside the telescope that will cause images to be fuzzy.