A red supergiant star appears to have changed in just a few years – an astronomical blink of an eye – which suggests it may ...

Each star is a SN exploding with the size indicating how bright it appears and the colour indicating the colour of the supernova, they go from blue (hotter) to yellow (cooler) as they grow older and ...

The supernova is visible in the image ... it balloons into a red giant, becoming cool, puffy and luminous. Over time, pulsations and stellar winds cause the star to shed its outer layers, leaving ...