Question

mapping of the radio emissions from extra terrestrial sources is known as

Answer 1

radio astronomy
not sure

Answer 2

"The mapping of radio emission from the extraterrestrial sources are done by the Radio Astronomy.

Radio astronomy is the branch or rather division of astronomy which deals with the study of extraterrestrial bodies at the radio frequency or the radio emission caused from them.

Thereby, some astronomical phenomenon emits radio signals from the invisible or hidden celestial bodies of some electromagnetic spectrum.

Radio telescopes are used which read those radio emission and amplify those radio emission waves which is then turned into digital signals which are then studied."