The Size of Things
How big are stars? Let's start with something close to home. Our sun is a star. To get an idea of just how big the sun is, let's compare it to the Earth.
The Earth looks pretty big -- it has oceans, mountains, very big cities. But as big as the Earth is, the sun could hold about 1 million 300 thousand Earth's inside of it.
So the sun must be a very big star, right? Wrong... the sun is actually small as star's go.
Some stars are so big that the sun with our Earth and some of the other planets revolving around it would fit inside of them. On the other hand, the smallest stars are only about 3 times as big as the Earth.