When a star runs out of fuel, astronomers often say that it has reached the end of its life. However, what they really mean is that it has reached the end of its ‘normal’ life. Astronomers call this ‘normal’, fuel burning part of a star’s life the ‘main sequence’ stage. But if this isn’t the end of a star’s story, what happens next?
NASA / CXC / SAO / JPL-Caltech / MPIA / Calar Alto / O. Krause et al.