/sci/ - Science & Math

>>12636523
>>12636514
Pic related is underneath Arecibo mk1 on Earth. The dish was made out of aluminum panels held together with steel cables. Micrometeors would either go through the holes or not really matter. Radiotelescopes are much less sensitive to being dirty than optical telescopes.

>>12636535
I'm not sure how much off-axis you can get from a spherical reflector like Arecibo but my intuition is quite a bit, with progressively less mirror doing work for you the further off axis you get

>>12636468
For the liquid mirror, you'd probably run an aquarium filter/sieve on your fluid to strain out micrometeor grit.