The examples that were originally classified as a nebula are Orion nebula, Hercules globular star cluster, Andromeda galaxy, and Ring nebula; option A, B, C, and D.
A nebula is a giant cloud of dust and gas that is found in space. More than one nebula is collectively called nebulae. The gases present in a nebla are usually hydrogen and helium.
Some nebulae are made from the gas and dust that are released by the explosion of a dying star, for example in a supernova.
Some other nebulae are the sites for the formation of new stars.
The four types of nebulae are:
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