Hubble Space Telescope image of the Ring Nebula (M57) – a planetary nebula in the constellation Lyra, formed from ionized gas expelled from a red giant star. The star, now a white dwarf, is visible at the centre. (Credits: NASA, ESA and the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration) – click to enlarge
Hubble Space Telescope image of the Ring Nebula (M57) – a planetary nebula in the constellation Lyra, formed from ionized gas expelled from a red giant star. The star, now a white dwarf, is visible at the centre. (Credits: NASA, ESA and the Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration)