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Are there "dark nebula" spots in the sky for radio telescopes? By that I mean, are there portions in the sky where these telescopes do not receive any radio waves? If so, do they match the visual dark nebula spots.

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    $\begingroup$ So you are looking for nebulas which absorb radio-frequencies emitted by the objects further behind? Which frequency range do you have in mind? $\endgroup$
    – B--rian
    Dec 8 '20 at 9:35
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    $\begingroup$ Those objects would have to have temperatures colder than the equivalent radio temperature - very unlikely, given that you have to equilibrate with a radiation field of 2.7 K at most. $\endgroup$ Dec 8 '20 at 12:44
  • $\begingroup$ @lB--rian I am just wondering in general if radio telescopes find spots in the sky in the same way that there are blank spots in the sky visually. $\endgroup$
    – Bookaholic
    Dec 9 '20 at 12:22

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