The main mirror, however, is not one single piece of glass, but made up of 91 hexagonal mirror segments which are all carefully joined and aligned to reflect the light as if they were one mirror.
Some facts about the telescope:
SALT is of a slightly different design to most large telescopes in that it points at a fixed angle of 37° (i.e. cannot move up and down), so can only rotate in a circle.
To compensate for its limited ability to point at the whole sky, there is a sophisticated tracker system that can move around over the main mirror and capture light from 70% of the night sky. And because the Earth rotates, this means that all objects are visible at some point during the night.