WOH G64 has never been an ordinary star. But starting a few years ago, WOH G64 faded considerably with Its characteristic pulsations significantly weakened. Most intriguingly, its spectrum changed fundamentally, switching from the cool absorption features typical of red supergiants to emission from hot ionised gas. WOH G64 will eventually explode as a supernova, but that drama remains for now a future event rather than an imminent one. Source : Keele led team reveals massive star WOH G64 is still a red supergiant