3 ms·
https://commons.wikimedia.org/wiki/File:Comparison_optical_telescope_primary_mirrors.svg https://commons.wikimedia.org/wiki/File:Comparison_optical_t...
by LargoLasskhyfv 5y ago
https://commons.wikimedia.org/wiki/File:Comparison_optical_telescope_primary_mirrors.svg https://commons.wikimedia.org/wiki/File:Comparison_optical_t...