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===Envelope===
===Envelope===
The envelope of gas surrounding the core is significantly larger than the core, with an apparent [[diameter]] of 386 arcseconds (337 ly) or 16 times the size of the core.<ref name=constellation-guide/> The envelope is significantly fainter than the core and only visible through large telescopes. This extended halo is believed to have a temperature of the order of 15,000 k.<ref name=constellation-guide/> The halo has a mass of 0.26-0.92 [[solar mass]]es.<ref name=constellation-guide/>
The envelope of gas surrounding the core is significantly larger than the core, with an apparent [[diameter]] of 386 arcseconds (337 ly) or 16 times the size of the core.<ref name=constellation-guide/> The envelope is significantly fainter than the core and only visible through large telescopes. This extended halo is believed to have a temperature of the order of 15,000 k.<ref name=constellation-guide/> The halo has a mass of 0.26-0.92 [[solar mass]]es.<ref name=constellation-guide/>
==Gallery==
<gallery>
File:Catseye-big.jpg|Core of the nebula by Hubble
File:NGC6543.jpg|Composite image of the nebula's core
File:NGC 6543 - The Cat's Eye Nebula Redux.jpg|Composite image of [[x-ray]] from [[Chandra]] and visible from [[Hubble Space Telescope|Hubble]]
File:Cat's Eye Nebula - GPN-2000-000955.jpg|Composite image taken by the Hubble Space Telescope
File:Heic0414b.jpg|The outer envelope of material
</gallery>
==References==
==References==