The amount of physical adjustments and maintenance needed to operate mirrors in the 15m+ diameter range, for visible and near IR/UV, are very hard in outer spac

The amount of physical adjustments and maintenance needed to operate mirrors in the 15m+ diameter range, for visible and near IR/UV, are very hard in outer space. For now it seems that earth-bound optical telescopes are still needed, even with all the orbital debree and atmospheric interference.