Image 5 of 52: Full Resolution
Amanda inside SALT! That's the 11-meter mirror below. It's made of 91 smaller 1-meter hexagonal mirrors. All of them are spherical, rather than parabaloid, which means that they can be taken out and put back in a different position because they're all identical. The mirror segments that look dark really are -- they are the ones that are most in need of re-aluminizing. You can see at least two of the mirrors are missing, due to aluminizing or other maintenance. From an optical standpoint, a missing mirror does not make a big difference.