Portal:Astronomy/Picture/26 June 2005
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![](http://upload.wikimedia.org/wikipedia/commons/thumb/d/d8/Cat%27s_Eye_Nebula.jpg/300px-Cat%27s_Eye_Nebula.jpg)
The Cat's Eye Nebula is one of the most intricate and complex planetary nebulae known. This Hubble Space Telescope image reveals a mass of twists and knots of material in the nebula's inner region. The origin of this structure is not yet well understood by astronomers.