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Super lightweight telescope mirrors made of nanocellulose and synthetic spider silk

Nanocellulose and (synthetic) spider silk are strong materials, nanocellulose is 8 times stronger than steel. They can also be combined (google “nanocellulose spider silk”).
Why can t lightweight telescope mirrors be made with nanocellulose or/and synthetic spider silk? There is “cellulose nanofiber plate” (CNFP) that has high strength, great thermal dimensional stability and excellent machinability. If surface roughness is not good enough for mirror coating then mirror surface can be some other material like glass, class ceramic, beryllium or silicon carbide, like Herschel space telescope that has carbon fiber mirror with silicon carbide plating.
Cheaply mass manufactured large telescope mirrors made of cheap but strong material can be made for amateur astronomers, for example cheap 2,4 m home telescope that has mirror size of Hubble space telescope can be in any amateur astronomer s backyard, if it is cheap enough. Andrew Rakich has made study of spherical optics telescopes, where mirrors are spherical, and spherical mirrors can be easily polished and mass manufactured automatically by robotic manufacturing line.
Nanocellulose (there are different forms of nanocellulose) can be coupled with synthetic spider silk if needed. Can nanocellulose and some other material be mixed together to form compound?
That large amateur telescope mirror can be segmented mirror type or multi-mirror telescope if that makes telescope lighter.
Also inflatable mirror type system where honeycomb mirror has honeycomb structure of rigid material but actual mirror cells are filled with gas and mirror surface is lightweight.
Also large professional telescopes can be made with nanocellulose / spider silk mirrors if they are competetive with manufacturing cost, quality, and strength to other telescope mirror materials.
Can nanocellulose-graphene composite be made? Or synthetic spider silk - graphene composite?
“Nanocelluloses and and their phosphorylated derivates for selective adsorption” 2015. “A silver-nanoparticle/cellulose-nanofiber substrate for spectroscopy” 2019. “In situ TEMPO surface functionalization of nanocellulose membranes”.
“Parallel paths: Designer and material scientist conjure up glimmering colours out of wood”, there is mentioned “splitting cellulose to nanoscale lengths”.
“Surface-modified nanocelulose for application in engineering” 2020, “Engineering surface roughness of nanocellulose film via spraying to produce smooth substrates” 2020. “Surface chemistry of nanocellulose” 2019, “Tuning nanoscale surface roughness and smoothness of nanocellulose film via spray coating”. “Surface modification of nanocellulose - handbook of…” 2017. “Nanocellulose: the next super versatile material for the…”. “Nanocellulose: extraction and application”.
And why not building telescope mount (telescope structure) from nanocellulose / spider silk? If that is eight times stronger than steel. Then only reflective surface (mirror plating on top of the mirror) and electric motors are not from nanocellulose. Telescope is then really lightweight. Can 100 m OWL telescope be build using nanocellulose and/or synthetic spider silk structures and/or mirrors?
Nanocellulose is probably much cheaper construction material than exotic composite materials, but has same properties or even better (eight times stronger than steel). So large telescope mounts can then be build relatively cheaply, and they are lightweight which brings down telescope price even more.