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The Saturn Nebula was the first
discoveries of William Herschel on September 7, 1782, when he started
his great survey. This remarkable planetary nebula has its name from
its appearance, which resembles a faint suggestion of the planet Saturn
with rings nearly edge-on.
The layers of the Saturn Nebula
give a complex picture of how this planetary nebula was created. This
picture, taken in April 1996, allows a better understanding of the mysterious
process that transformed a low-mass star into a white dwarf star. A
computer model indicates that the central star of NGC 7009 first expelled
the green gas that now appears barrel shaped. This green gas now confines
stellar winds flowing from the central star, creating a jet which forms
the ansae that appear in red at the tips. Much remains unknown, including
why the gas has not become turbulent.