Seeing the full radiation spectrum Matter radiates at many different wavelenghts - all the different forms arrive at Earth from other parts of the Universe. The eye detects only visible light. All the other forms of radiation require purpose-built detectors and telescopes. This is the 64 metre dish of the Parkes Radio Telescope which began operating in 1961. With radio telescopes, we discovered: interstellar and intergalactic gas clouds organic molecules in interstellar space pulsars and quasars galactic magnetic fields