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Stars
 * Each star in the sky is a massive glowing ball of gas, held together by gravity. Stars can live for billions of years. **

What is the closest star? The nearest star to Earth is the Sun, it is about 92 million miles away. Which is the source of most energy on the earth.Other stars become visible when they are not outshone by the sun.

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= = Stars and constellations for dummies

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Red Dwarf Star
 * The Red Dwarf Star is small and relatively cool star. they have low temperatures in their cores and generate energy very slowly. this star emits very little light sometimes as low as 1/10,000th of the sun. Even the largest red dwarfs only produce 10% of the suns light. Red dwarfs have longer estimated life spans than the estimated by far the most common type of star in outer spaceage of the universe. The lower mass of of a red dwarf the longer the lifes pan it will have. It is belived that the life span of these stars exceed 10 billion years. Red Dwarf stars are by far the most common star in outer space. However from Earth we cannot see many Red Dwarfs because they are so small and emit very little light. **

Yellow Star These are medium sized stars, they are yellow because they have a medium temperature. Their higher temperature causes them to burn their fuel faster. This means they will not live as long, Only about 10 billion years. Near the end of their lives, Yellow stars grow very large. When this happens to the Sun it will grow to engulf even the Earth. Eventually they shrink again, leaving behind most of their gas. This gas forms a pretty cloud around the star called a Planetary Nebula.



Blue Giant Star ** Blue Stars are large and compact. They burn their fuel very quickly, which gives them a high temperature. They run out of fuel in about 10,000 – 100,000 years. Blue Giants are very bright, they shine a far distance. They are rare but make up many of the stars we see at night. Blue Giants die in a magnificent way, they grow larger; just like sun sized stars. Instead of shrinking they explode in what is a super nova. Super nova explosions can be brighter than an entire galaxy, they can be seen very far away. Blue giants have a short life time, Scientists use them to find places in outer space, where newstars are forming.




 * Emission Nebula **
 * Emission Nebulae emit their own light. They emit light by glowing red or pink as they expel extra energy which they get by nearby stars. Bright stars inside the clouds charge hydrogen gas with extra energy. The hydrogen in these clouds does not like to be charged and so they get rid of the extra energy by emitting it in the form of red light. The cloud itself is actually glowing, just like a neon sign. Scientists believe that new stars form inside of nebulas. Sometimes the dust and gas in these clouds begins to contract together. When things such as clouds contract together they get hotter. The denser the cloud gets the hotter it gets. Eventually it gets dense enough, and hot enough to ignite its fuel. Beginning its new life as a star. **

**Reflection Nebulae** A blue reflection nebulae is completely different from an emission nebulae. This is because rather than emitting their own light, they are reflecting the light of stars around them. Reflection nebulae are blue for the same reason our sky is blue. They reflect the light of a star. Our sky is reflecting the light of the sun. When light passes by a particle of dust, the blue colour in that light is scattered. While the rest of the colours in the light are allowed to travel undisturbed. This blue light travels around the cloud bouncing off of dust particle, after dust particle until it eventually escapes the cloud and reaches our eyes.

Although this third type of nebulae is called a planetary nebulae, it actually has nothing to do with planets. A planetary nebulae is formed when a dying sun sized star begins to shed its outer layers. When the sun begins to die it will expand and become what is called a giant star. It will grow so large that it may engulf the Earth. After millions of years as a giant star; the sun will again shrink down to its normal size. As it shrinks much of its surface layers will be shed, leaving behind a beautiful ring. This ring is only visible for about 50,000 years. Over time the Nebulae mixes into surrounding space eventually becoming too thin to see.
 * Planetary Nebula **