Final answer:
The births of new stars have been best mapped recently in infrared and microwave wavelengths. Microwave wavelengths are also used in mapping star formation, as they can reveal the cooler gas and dust that surround young stars.
Step-by-step explanation:
The births of new stars have been best mapped recently in infrared and microwave wavelengths.
Infrared light is emitted by warm objects, so it is able to penetrate the dust clouds in which stars are born, allowing astronomers to observe the process of star formation. Microwave wavelengths are also used in mapping star formation, as they can reveal the cooler gas and dust that surround young stars.