FIg11_4 Cat's Eye Nebula

FIg11_4 Cat

Fig. 11.4 . A detailed view of the planetary nebula known as the Catís Eye Nebula, and formally designated NGC 6543. It reveals concentric rings, jets of high-speed gas, and shock-induced knots of gas. At least eleven large concentric shells mark the dense edges of spherical bubbles of gas and dust that have been ejected from a dying Sun-like star in regular, explosive pulses at 1,500-year intervals. The formation of more complex inner structures is not well understood. (A Hubble Space Telescope image courtesy of NASA/ESA/HEIC/the Hubble Heritage Team, STScI/AURA.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University