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What is a nebula? The term is taken from the Latin word for cloud. It applies to just about any hazy object seen through a telescope, so that it appears “nebulous.� In astronomy, the “nebula� can be bright illuminated gases such as in the Helix Nebula, or a dark cloud of dust as in the Horsehead Nebula. The clouds of gases can represent the birthplace of stars (which I will show you with the Cocoon Nebula) or the death of stars, such as in supernova remnants….