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The Cat's Eye Nebula (NGC 6543) is a planetary nebula made from material sloughed off by a dying sunlike star.

It also has an enormous halo of very faint gaseous material more than three light-years across. This probably formed tens of thousands of years ago in an earlier stage of the star's evolution.

[Image credit: Data: Michael Joner,  Romano Corradi, Hubble Legacy Archive Processing – Robert Gendler]


Mona Evans
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