Star's last hurrah
The nebula NGC 2440 lies around 4,000 light-years from Earth in the direction of the constellation Puppis.
This image, taken by the Hubble Space Telescope, shows the colourful "last hurrah" of a star like our sun. Ultraviolet light from the burned-out white dwarf star – the white dot in the centre – makes the surrounding cocoon of gases glow with different colours depending on composition, density and proximity to the hot central star.
Blue is helium, blue-green oxygen, and red nitrogen and hydrogen.