<p>Are there &quot;dark nebula&quot; 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.</p>

CC BY-SA 4.0
2020-12-08T09:35:02.940Z
So you are looking for nebulas which absorb radio-frequencies emitted by the objects further behind? Which frequency range do you have in mind?
B--rian
CC BY-SA 4.0
2020-12-08T12:44:57.840Z
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.
AtmosphericPrisonEscape
CC BY-SA 4.0
2020-12-09T12:22:51.607Z
@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.
Bookaholic
<radio-astronomy><nebula>
Are radio telescopes finding radio-dark Nebulas
Bookaholic
# Are radio telescopes finding radio-dark Nebulas

(Asked by: username_0 on 2020-12-08)

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.

**Tags:** radio-astronomy, nebula
> **Comments:**
> **username_1**: So you are looking for nebulas which absorb radio-frequencies emitted by the objects further behind? Which frequency range do you have in mind?  
> **username_2**: 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.  
> **username_0**: @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.  

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## 0 answers

