Wednesday, December 19, 2012

NGC 5189 (Picture of the Day: 12/19/12)

NGC 5189. Source

This planetary nebula is very strange. Usually, nebulae like this are created by the expelled matter of a star, making them spherical. This nebula certainly isn't a sphere, however. Why is this? One hypothesis is that the star throwing off this matter is a part of a binary system. 

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