Earth goes around the Sun once every year.
The Earth along with other planets orbiting the Sun is called the Solar System.
The Sun is just one of billions of stars, which form the Milky Way Galaxy- there are billions of other Galaxies forming the Universe.
Distances in Space are so large, they are measured in Light-Years.
Sun and planets are most likely formed from dust, ice and gas. Gravity pulled them together, and at this stage they are called protostars.
Nuclear fusion makes elements such as hydrogen(main fuel) and helium.
Blue stars burn at a higher temperature, fuel runs out quickly, becomes a supernova explosion.
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