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Black hole - frequencies used for viewing

  1. Aug 11, 2012 #1

    In space missions why do they choose different frequencies for viewing stars?

    For example why do they choose both 43 GHz and 230 GHz to view a black hole?

  2. jcsd
  3. Aug 11, 2012 #2


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    Staff Emeritus
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    Different frequencies are emitted by different types of objects. They also can penetrate different things in space, such as visible light being blocked by dust while radio-infrared is able to penetrate it. I can't say why 43 ghz and 230 ghz is used to view certain black holes, but I assume it's either because much of rest of the spectrum is blocked or because the black hole emits radiation specifically at these frequencies.
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