The Suns next stage is to get hotter and slightly increase in size.
In about 4.5 -> 5 billion years, it will have used up all of it's hydrogen, and will begin to fuse helium in it's core. Due to this, it's outer envelope will have expanded almost to the edge of the Earth.
Don't worry - we will all be dead by then.
After another billion years, the Sun will shed it's outer envelope as a planetary nebula and settle down to a retirement as a white dwarf for quite a few billions of years.
In development? It will next bloat and become a red giant.
red giant
red giant
it is fusion of hydrogen into helium. (like our sun) if it is a red giant (the next stage of our suns life) it is burning helium into denser things.
Evaporation.
For a star like ours, the black dwarf stage For an immensely massive star, a back hole.
White Dwarf then Black Dwarf=Dead Star
next stage
Alan Rickman's next appearance on stage should be the next harry potter book.
Basically there is no "next stage". Well, it is believed that a black hole will evaporate, but that will take a long, long time.
The stage that typically comes after apprenticeship is journeyman. At this stage, individuals are considered skilled and experienced in their craft and can work independently. It is a step towards becoming a master in certain trades.
Plumage
For a star like ours, the black dwarf stage For an immensely massive star, a back hole.