Radio Telescope Resolution - Centaurus A

Timiop2008 · Nov 22, 2008

Problem:
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!

mgb_phys · Nov 22, 2008

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?

Radio Telescope Resolution - Centaurus A

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Radio Telescope Resolution - Centaurus A

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