This is filler for my next post in star death, but thought I should show you something relevant to stellar evolution. This one is a yellow hypergiant, in fact, the largest yellow hypergiant discovered. Yellow hypergiants are one stage of a 25 plus solar mass star, and they are very rare. One of the great things about this one is that as decades went by, the swelling and cooling of the star was noticeable. That rarely happens over human lifetimes, as changes in stars happen over millions or billions of years. Another fascinating thing is that the star swelled so large that it is pretty much touching its smaller binary counterpart. I don’t know how exactly this will play out, but as the article says, it will probably affect how the star evolves in the future.
Rare Snapshot of Rapidly Evolving Star