These are pictures of the formation sequence of really BIG stars. Each picture is hyperlinked to a description of the picture for background information IF you need it. Use sketches or pictures from the WWW to support your description. The sun, the earth, and the rest of the solar system formed from a nebular cloud of dust and gas 4.6 billion years ago. The early earth was very different from the planet we live on today.
Stars produce energy from nuclear reactions, primarily the fusion of hydrogen to form helium.
These and other processes in stars have led to the formation of all the other elements. Go back to lesson .