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strongmanmike2002 | all galleries >> Images taken prior to 2012 >> Planetary Nebulae >> The Helix Nebula - the ultimate collection > Shell structure in the Helix
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23-FEB-2010

Shell structure in the Helix

There appears to have been at least 6 distinct periods of activity in the life
of this planetary nebula showcased by the 6 distinct shells of gas.


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