SPACE-NABULAE AND STAR CLUSTERS.

A NEBULAE IS A CLOUD OF DUST AND GAS inside a galaxy .Nebulae become visible if the gas glows , or if the cloud reflects starlight obscure light from more distant objects .Emission Nebulae shine because their gas emits light when it is stimulated by radiations from hot young stars .Reflection Nebulae shine their dust reflects light from stars in or around the nebulae.Dark nebulae appear as silhouettes they block out light from shining nebulae or stars behind them. Two types of nebulae are associated with dying stars ;planetary nebulae and supernova remnants . Both consist of expanding shells of gas that was once the outer layers of the stars.A planetary nebulae is gas shell drifting away from a dying stellar core.. A supernova remnant is a gas shell moving away from a stellar core at great speed following a violent explosion called a supernova. Stars are often found in groups known as clusters.Open clusters are loose groups of a few thousands of young stars that were born in the same cloud and are drifting apart . Globular cluster are densely packed , roughly spherical groups of hundreds of thousands of older stars.

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