The Milky Way Galaxy is 100,000 light-years wide and from the sun to the center is 28,000 light-years. The center is 10,000 light-years wide and a black hole is believed to be in the center of it because some stars were recorded to be going 10 times there normal speed which is probably because the matter is being sucked in. In the center the heat is so intense, about 80 million suns, and the galaxy was formed 14 billion years ago. It is so wide that it takes our sun 220 million years to go around it once.
There are about 100 billion stars in the Milky Way and all of them have gone through at least one of the cycles. Surrounding the galaxies is a lot of matter that cannot be seem and is believed to be dead stars. If this is so there are a lot of stars that have been formed in just our galaxy. Just think how many there would be in the universe.