The 21-cm emission is used mainly to map out globular clusters around the Galaxy.

Question

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The 21-cm emission is mainly used to study the distribution of neutral hydrogen gas in the Galaxy and in other galaxies, as well as to investigate the large-scale structure of the Universe. It can also be used to investigate the properties of interstellar medium and to detect the presence of magnetic fields. Globular clusters are usually studied through optical and infrared observations.

The 21-Cm Emission Is Used Mainly to Map Out Globular