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nebula
Pictures: R. Sahai and J. Trauger (JPL), the WFPC2 Science Team and NASA |

Hourglass Nebula

Before Hubble took a look at this planetary nebula, the cosmic structure appeared as a large pair of outer rings and a smaller ring in the center. Hubble's image shows a strange hourglass shape with intricate etchings along the walls. How it formed this way remains a mystery.
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