Astrophysicists interpret astronomical data gathered by astronomers to understand how our universe works. Astronomers view the entire electromagnetic spectrum called Multi-Frequency Astronomy through optical telescopes, radio telescopes, microwaves, gamma-rays, and X-rays.This comprises a core of radio telescopes in the Karoo, and is one of many projects supported by our own South African Large Telescope (SALT), an optical telescope sited at Sutherland.