Apart from 21cm line studies, radio emissions as well as signatures of different radio sources, do radio frequencies help in the identification of a particular physical structure or presence of some certain specific elements/matter present in the galaxies? If so, what are they?

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    $\begingroup$ The difference between a planet and a galaxy is immense. This makes your question slightly oddly phrased. Do you know about the 21 cm line of Hydrogen? $\endgroup$
    – James K
    May 8 at 15:51
  • $\begingroup$ Yes, I agree.To answer your question: yes, I am aware about tthe 21cm line $\endgroup$ May 8 at 17:45
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    $\begingroup$ Jupiter has decameter radio emission from 1 to 40 MHz (300 to ~7.5m wavelength) caused by the planet's magnetic field. Searches for radio emission from exoplanets are underway; a recent (open access) paper conclusions suggests radio emission from exoplanets out to ~20pc may be possible if the exoplanets have mag. field strengths 1-10 million times stronger than Jupiter (as expected for close-in exoplanets). This leaves the vast majority of the galaxy unsearchable for planets in the radio. Q needs some clarity $\endgroup$ May 8 at 18:43
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    $\begingroup$ "Yes, I agree." - can you fix your question? I makes no sense to ask about emission from planets and galaxies in the same question. $\endgroup$
    – James K
    May 8 at 19:01
  • $\begingroup$ I have made the required changes. $\endgroup$ May 9 at 3:09


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