Radio Telescope

Karl Jansky's 1932 discovery of static from the Milky Way launched a new era; subsequent dishes like Arecibo's 305-meter reflector and FAST's 500-meter aperture capture wavelengths from 0.3 mm to 30 meters, enabling the discovery of pulsars, quasars, and the cosmic microwave background at a precision of 1 microjansky, which is 50 times fainter than the typical radio source.