A nebula is simply an interstellar cloud of of dust hydrogen helium and other ionized gases. Originally nebula was a name for any diffuse astronomical object, including galaxies beyond the Milky Way.

Most nebulae are of vast size even millions of light years in diameter. The Orion Nebula the brightest nebula in the sky. The Orion occupies a region twice the diameter of the full Moon can be viewed with the naked eye but was missed by early astronomers.

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.

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