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Nebulae and their types Nebula is an intergalactic cloud in reality, which has a negligible quantity of 90% hydrogen, 10% helium and other heavy elements. It is such a quaint gaseous cloud that is ever bright and attractive and sometimes dark is dark. They have played an important role in the evolution of the universe because these are the essential ingredients for the formation of stars and planets. These are seen in the night sky as a bright and shadowy shape, or in the form of a bright shadow in the background of any other published body. Nebulae and their types Observational History The history of inspecting nebulae is thousands of years old. In the second century AD, Ptolemy has mentioned five nebulae, 800 years after its mention, Abn al-Rahman Suri has mentioned a small cloud in place of the Devyani galaxy (Andromeda Galaxy). In 1610, Nicolas Claude Fabri de Peiresc inspected the Oraon Nebula with the telescope for the first time. After this, there was a flood of ins...