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SlideshowReport

Some Shapes of Planetary Nebulae

Description
Some Shapes of Planetary Nebulae
The outer shells of dying low-mass stars are ejected in a wonderful variety of patterns.
(a) An exceptionally spherical remnant, this shell of expanding gas, in the globular
cluster M15 in the constellation Pegasus,is about 7000 ly (2150 pc) away from Earth.
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