Stars also change as they age. Stars are born out of huge clouds of gas and dust that fill some of the space between the stars. Our Sun is now about halfway through its middle age. It will continue to give us light and heat for another 5 billion years. How long a star lasts depends on how big it is.
Smaller stars live calmly for hundreds of millions of years and die much more quietly.
Stars all seem to be made up of the same elements that are found on Earth, even though they can be different sizes, temperatures, and ages. Our Sun is an average-size star, maybe a little smaller than most stars. Stars the size of our Sun are known as Dwarf Stars. The largest stars can be 10 times larger across then the Sun. These are called Giant or SuperGiant stars.