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Nature 429, 29-30 (6 May 2004) | doi:10.1038/429029a
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Astronomy: Dust-filled doughnuts in space
Julian Krolik1
Abstract
The first images of an extragalactic object to have been captured using infrared interferometry reveal the doughnut-shaped cloud of dust that obscures the heart of a nearby active galaxy.
Active galactic nuclei are among the most exotic objects in the Universe. They radiate as much light as an entire galaxy from a region the size of the Solar System and, unlike stars, spread that light over the entire electromagnetic spectrum, from radio waves to 
-rays.
- Julian Krolik, of Johns Hopkins University, is currently at the Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK.
Email: jhk@ast.cam.ac.uk
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