Originally Posted by galexander
Polished metal makes a very good mirror in actual fact Astronut.
You overestimate how well "polished" the aluminum of ISS is. Aluminum can be as dull as it can be vibrant. You can't see your reflection in the surfaces of ISS:
I can't believe you're actually comparing Aluminum coating on telescope mirrors to any and all other applications of aluminum. I used to have a small slab of industrial aluminum, not well polished, but smooth to the touch. It was anything but shiny.