Credit: Image courtesy of M.A. Guerrero, University of Illinois, USA and ESA.

Color composite of XMM-Newton and Hubble Space Telescope images of NGC 7009, the Saturn Nebula made by M. A. Guerrero. This image offers the opportunity to locate the hot, X-ray-emitting gas (blue in this image) relative to the cool, ionized nebular shell seen in optical wavelengths (Hα in red and [N II] in green). The XMM-Newton image was obtained by a team led by Y.-H. Chu (University of Illinois) and the Hubble Space Telescope images were taken by a team led by B. Balick (University of Washington).