The First Green Star Ever Found: A Planet-Eating 'Zombie' 280 Light-Years Away

There are no green stars. That has been one of astronomy's quiet rules for as long as anyone has looked up: stars can be red, orange, yellow, white or blue — never green. This week, that rule broke. Astronomers announced they have identified the first green star ever found: a ghostly chartreuse stellar remnant 280 light-years away that turned green after devouring the remains of its own planets.

Meet WD J1330+6435

The star, catalogued as WD J1330+6435, sits in the constellation Draco. It is a white dwarf — the dense leftover core of a star that burned through its nuclear fuel and blew off its outer layers long ago. According to the research team led by astrophysicist Mark Hollands of the University of Warwick, bits of rocky planetary material have fallen onto the dwarf's surface, enriching its outer layers with elements including calcium, lithium and — crucially — sodium.

Why sodium made it green

In ordinary stars, sodium absorbs a very specific wavelength of orange light — the same orange glow of sodium street lamps. But a white dwarf's surface is extraordinarily dense, and the sodium atoms there are constantly bombarded by surrounding helium atoms. That bombardment shifts sodium's atomic energy levels, changing which wavelengths it absorbs. The result: instead of looking white like a typical white dwarf, this one glows green. The study was published in the journal RAS Techniques and Instruments.

A cosmic crime scene — just in time for Halloween

What makes the discovery genuinely important is not the color itself but what it records. The planetary debris on the star's surface is a forensic trace of a destroyed solar system — the star expanded, swallowed its planets, died, and is now slowly digesting their remains. Scientists describe these objects as cosmic zombies, and one astronomy outlet noted the timing could hardly be better with Halloween approaching. The same study also turned up the reddest star ever recorded, plus evidence that white dwarfs can appear in surprising shades of purple and pink too.

It is a reminder that the universe keeps filing exceptions to our neat categories — and that some of the strangest things in space are the corpses of worlds that once had skies of their own. For another recent cosmic oddity, see our piece on the black hole that played a treble clef across the stars.

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