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Homework Help: Radio Telescope Resolution - Centaurus A

  1. Nov 22, 2008 #1
    Centaurus A is 15 million light years away and a radio telescope can resolve structures of 1s of arc across. Show that the Structure is 75 light years across.
    Please Help!
  2. jcsd
  3. Nov 22, 2008 #2


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    1 sec of arc is 1 / 60 * 1/60 of a degree.
    Imagine a circle 15M light years in radius with you at the centre, what length of the circumference would 1arcsec measure?
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