woh g64 has taken a dramatic turn, and astronomers say the massive star may be moving into a rare yellow hypergiant stage. The change was identified in research led by Gonzalo Muñoz-Sanchez at the National Observatory of Athens and published in Nature Astronomy on Tuesday ET. The star sits in the Large Magellanic Cloud, a neighboring dwarf galaxy, and the new findings suggest it may be edging closer to the final phase of its life.
What changed in woh g64
The key shift appears to have happened in 2014, when woh g64 showed a major change in color and structure. Long-term monitoring had already shown the star behaving unusually, but the new study says the latest evidence points to a transition from a red supergiant into a rare yellow hypergiant.
That matters because the change may reflect a star shedding its outer layers while its core shrinks inward. In the study’s interpretation, that is the kind of unstable behavior that can come before a supernova. Astronomers have tracked woh g64 for decades, and the star’s unusual brightness cycle helped make the shift stand out.
WOH G64 was first identified in the 1970s as a star of interest in the Large Magellanic Cloud. It later became known as one of the largest ever discovered, with a radius more than 1, 500 times that of the Sun.
Why astronomers are watching so closely
A major clue came in 2024, when woh g64 became the first star beyond our galaxy ever photographed in detail with the Very Large Telescope Interferometer. That image showed a thick dusty cocoon around the star, reinforcing the idea that it is losing mass as it ages.
The research team says the 2014 change may have been caused by the ejection of a large part of the star’s surface. One possible explanation is interaction with a companion star, which the authors say they confirmed through the spectrum of light from woh g64. Another possibility is that the star is entering a pre-supernova “superwind” phase tied to strong internal pulsations as fuel in the core runs down.
Gonzalo Muñoz-Sanchez, the study’s lead author at the National Observatory of Athens, said the evidence points to a major transformation in the star’s outer layers. The team’s view is that the star may be showing the kind of rapid change that can come before a massive stellar death.
What this could mean next
WOH G64 is still a young star in cosmic terms, with an estimated age of less than 5 million years. But unlike the Sun, it is expected to live fast and die young, and stars of this size are understood to end in a supernova or, in some cases, collapse into a black hole with little visible display.
That is why astronomers are treating woh g64 as a rare real-time case study. The star’s continued fading and shifting appearance will be watched closely, because the next phase could clarify whether this is a genuine transition or a more complex masking effect. Either way, woh g64 is now one of the clearest examples of a giant star changing fast enough to keep researchers on alert, and the next observations may show whether it is truly nearing a dramatic end.
