Astronomers find a white dwarf that glows green

University of Warwick astronomers calculated that white dwarf WD J1330+6435, whose atmosphere contains sodium, would appear chartreuse green to the human eye. Sodium absorbs orange light, leaving a green glow. About one in thirty white dwarfs may have unusual colors.

• WD J1330+6435 is about 4,000 °C and enriched with calcium, lithium and sodium
• Sodium absorbs orange light, leaving a ghostly green glow
• Five of 151 white dwarfs within 65 light-years have unusual colors
• WD J1011+2845, 48 light-years away, may be the reddest star recorded