https://youtu.be/QqRREz0iBes?si=vGN3JaJnYLI1l17N
This half-hour video was way more interesting than I guessed. If you don't have time for the whole thing, watch at 9:42 how the mirror is cleaned. And again at 13:52 how lasers pointed skyward allow them to deform the mirror every few milliseconds to compensate for distortion in the atmosphere.
He explains the incredible efforts to combat problems like heat, atmospheric distortion, dust accumulation, and nanometer-precision mirrors that are needed for cutting edge telescopes.
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