This Hubble telescope image shows one of the most complex planetary nebulae ever seen, NGC 6543, nicknamed the "Cat's Eye Nebula." Hubble reveals surprisingly intricate structures including concentric gas shells, jets of high-speed gas, and unusual shock-induced knots of gas. Estimated to be 1,000 years old, the nebula is a visual "fossil record" of the dynamics and late evolution of a dying star.
A preliminary interpretation suggests that the object might be a
double-star system. The dynamical effects of two stars orbiting one another most easily explains the intricate structures, which are much more complicated than features seen in most planetary nebulae. The two stars are too close together to be individually resolved by Hubble and instead appear as a single point of light at the center of the cats.eye.nebula.

Two tom-cats and a cat in heat, that's the theme of catseye, a composition for classical guitar quartet. The  tom-cats brawl in a ring of cheering and jeering vagrant cats. All the sounds of the piece are produced by  four guitars and the voices of the artists.
The composition is based on the image of NGC 6543, "Cat's Eye Nebula" and the name "Alexander Ustinov", team leader of NTONYX, to whom the piece is dedicated. The recording uses samples from my own guitar,  built by the famous Spanish guitar maker José Ramirez and played by myself, as well as samples for the Nemesys GigaStudio  by www.ntonyx.com.