Big Gassy Balls
Stars look very pretty. And they are, both up close and far away. Each one may look very small but truly they are gigantic. A star is a giant ball of many gasses that are contently interacting and exploding. and it is all held together by gravity.
Scientist can tell how old a star is by how it moves and where it is. they can even tell its mass and what it is made up of. After a stars basic chemicals run out and its inner core gives way, it expands into a red giant. (like our Sun.) During its red giant stage it interacts heavier elements. At this time the core becomes a White dwarf or Neutron star. Or it could become a black hole!
A Neutron star is an extremely dense star that is made of neutrons giving it an electrical charge. This star has massive gravity and usually ends in becoming a black hole.