Everything in your body, and everything you can see around you, is made up of tiny objects called atoms. Atoms come in different types called elements. Hydrogen, oxygen and carbon are three of the most important elements in your body.
How did those elements get into our bodies? The only way they could have got there, to make up all the material on our Earth, is if some of those stars exploded a long time ago, spewing all the elements from their cores into space. Then, about four and a half billion years ago, in our part of our galaxy, the material in space began to collapse. This is how the Sun was formed, and the solar system around it, as well as the material that forms all life on earth.
So, most of the atoms that now make up your body were created inside stars! The atoms in your left hand might have come from a different star from those in your right hand. You are really a child of the stars.
-from A Universe from Nothing: Why There Is Something Rather than Nothing