Space Wallpapper Image – Planetary Nebula NGC 2440
A Sun-like star ends its life by casting off its outer layers of gas, which form a cocoon around the star’s remaining core. Ultraviolet light makes the material glow. The burned-out star, called a white dwarf, is the white dot in the center.
Credit: NASA, ESA, and K. Noll (STScI)
Acknowledgment: The Hubble Heritage Team (STScI/AURA)