The Orion Nebula
Click on image for full size
The Sun and planets began as a cloud of gas, just like the one shown in this picture. The cloud was probably made of hydrogen and helium gas (the same gas which goes into a helium ballon which you can buy at the circus). Such a cloud is called a Nebula. "Nebulae" is a word that means more than one nebula. The gas in a nebula such as this is used to make new stars.
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