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__STARS.__ __What are stars?__ Stars are huge balls that are held together by gravity.

__Facts.__ . The nearest star to Earth is the Sun, which is the source of most of the Energy on Earth. . Other stars are visible in the night sky. . Most stars are between 1 billion and 10 billion years old. . The bigger the star the shorter lifespand it has. . Most stars are Red dwarfs. . There are about 250 billion stars in a galaxy. . ** Most stars come in multiples ** . Stars can be red,white and blue.

__Types of stars.__ There are Seven types of stars in the universe. The stars are in order from decreasing temperator. The main stars are O,B,A,F,G,K and M. O and B are really bright but not very commen. M stars are very commen but they are dull. __Red Dwarfs.__ Red Dwarf stars are small and relatively cool. This star only gives very little light sometimes it only gives as low as 1/10,000th of the sun. Even the biggest Red Dwarfs only produce 10./. of the suns light. From Earth we can only see a fe Red Dwarfs as they are so small and only give very little light. Red Dwarfs have longer estimated lifespan then any other star in the universe.



__Yellow stars.__

Yellow stars are medium sized stars. Yellow stars are yellow as the have a medium temperature. Yellow stars will only live about 10 billion years. Yellow stars grow really big. Eventually the stars shrink and they leave behind most of their gas. This gas forms a cloud around the star called a Planetary Nebula.

__Blue Giant Stars.__

Blue giant stars are big and compact. Blue giant stars are rare but they make up for many of the stars at night. Blue giants burn fuel very quickly, so that gives them a high temperature. Blue giants run out of fuel in about 10,000-1000,000 years. Blue giants shine a far distance and they are very bright. Blue giants die by growing larger just like the sun sized stars.



__Emission Nebulae.__ ** Emission Nebulae give there own light.They give light by glowing pink or red. Emission Nebulae expel extra energy which they get by nearby stars. The hydrogen in these clouds does not like being charged so they get rid of extra energy by emitting it. Sometimes the gas and dust in these clouds begins to stick together. When things like clouds are stick together they get hotter. The thicker the clouds get the hotter it gets. **



__Planetary Nebulae.__


 * This third type of Nebulae is called a planetary nebulae. This has nothing to do with planets. Planetary nebulae is formed when a dying sun sized star begins to shed to die. It will get so big it might engulf the earth. Over time the nebulae mixes into surrounding space becoming to small to see. **

__ Giant Stars. __ A Red Giant star is a star in the last phase of its life. After millions of years a a Red Giant star will turn into a white Dwarfand then it dies.Red Giant stars can be yellow, orange or red.


 * Red Giant Star ||