Nebula is a beautiful objects in the universe which cannot be ignored when it comes to discuss about universe. What is it exactly?
In Latin word Nebula means "Cloud". It is an interstellar cloud of dust, hydrogen, helium and other ionized gases. Nebula is not just a cloud of dust, hydrogen, helium and other ionized gases but it is also a "Stellar nurseries" i.e. the place where new stars are born. Most nebulae are of vast size, even hundreds of light years in diameter.
The Orion Nebula, the brightest nebula in the sky that occupies a region twice the diameter of the full Moon, can be viewed with the naked eye. A nebula that is barely visible to the human eye. Many nebulae are visible due to their fluorescence caused by the embedded hot stars, while others are so diffuse they can only be detected with long exposures and special filters.
Gas Pillars in the Eagle Nebula (M16) Pillars of Creation in a Star-Forming Region
Nebulae are often star-forming regions, such as in the "Pillars of Creation" in the Eagle Nebula. In these regions the formations of gas, dust, and other materials "clump" together to form denser regions, which attract further matter, and eventually will become dense enough to form stars. The remaining material is then believed to form planets and other planetary system objects.
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