X-ray emission (purple) fills the inner shell of the Cat's Eye Nebula, a planetary nebula in the constellation of Draco, as shown by this composite X-ray and optical image. (X-ray: NASA/UIUC/Y.Chu et al., Optical: NASA/HST)
X-ray emission (purple) fills the inner shell of the Cat's Eye Nebula, a planetary nebula in the constellation of Draco, as shown by this composite X-ray and optical image. (X-ray: NASA/UIUC/Y.Chu et al., Optical: NASA/HST)