> This is also the first thing that came to my mind. How do the filter noise? Or are we missing something that is not described in the article? The mirrors are

> This is also the first thing that came to my mind. How do the filter noise? Or are we missing something that is not described in the article? The mirrors are suspended from pendula: https://www.advancedligo.mit.edu/sus.html https://www.advancedligo.mit.edu/sus.html