Gary Imm

GaryI

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A backyard amateur astrophotographer enjoying retirement with my wife on beautiful Lake Livingston in Onalaska, Texas, about 90 minutes north of Houston.

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At first, these nebulae appear to be bi-polar, like most pN. But examining their disks carefully, it seems likely that the Owl-type PNe have spherical shapes - they are almost exactly circular in shape and uniform in brightness, with no strong brightening near the rim. The dark void areas are what trick us, in terms of creating a “bi-polar” look. Scientists still do not understand the cause of the bi-polar look to the dark voids.