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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1$\begingroup$ 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--rianCommented Dec 8, 2020 at 9:35
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1$\begingroup$ 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. $\endgroup$– AtmosphericPrisonEscapeCommented Dec 8, 2020 at 12:44
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$\begingroup$ @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. $\endgroup$– BookaholicCommented Dec 9, 2020 at 12:22
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