Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. The nebula's central star itself is clearly immersed in the multimillion degree, x-ray emitting gas. Other pockets of x-ray hot gas seem to be bordered by cooler gas emitting strongly at optical wavelengths, a clear indication that expanding hot gas is sculpting the visible Cat's Eye filaments and structures.
Specific rights apply .