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What is an emission nebula? | Earth, Solar System and Universe.

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Nebulae are great clouds of interstellar dust and gas where stars are born. The emission nebulae are bright clouds of gas and dust that host young stars in its interior.
At the beginning, the nebulae are dark and cold. As the interstellar material is concentrated, the pressure and the temperature in the Centre of the Nebula rise. When they get to accumulate the sufficient amount of matter, a star is born inside the nebula.
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The new star heats the nebula. The hot gas lights and dark Nebula becomes an emission nebula.
In the emission nebula new stars are formed while girls illuminate it more and more. Emission nebulas created the most varied forms, and are the most beautiful images of the Cosmos.

Emission nebulas

Some of the most beautiful and known emission nebulae are:
Orion Nebula: is the most brilliant and known. It is 1,500 light years from Earth in the constellation of Orion, and measures about 30 years light. It is the nearest emission nebula. You can see even with the naked eye, as a white patch on the left under the belt of Orion. It was the first Nebula in photo taken, almost 150 years ago.
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Of the Eagle nebula: 7,000 light years away in the constellation of the snake. It has an extension of 70 light years. There are the famous pillars of creation. Three enormous pillars of material, dust and gas several years are light. Photographed them the Hubble in 1995 and they are probably the most beautiful image of the Cosmos taken until today.
Nebula NGC604: located in the Triangulum Galaxy, is the emission nebula largest referred to. It measures 1,500 years light in diameter and is more than 6,000 times brighter than the Orion Nebula. It is the area of the Local Group where more stars are born.
Carina nebula: is about 8,000 light-years, in the constellation of Carina, in the southern hemisphere. It is one of most big and bright nebulae that are known. Its expansion more than 300 years light. It contains several of the most massive stars of the milky way.
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