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A fine example of an emission nebula is the Orion Nebula (M42). Reflection Nebula-A reflection nebula differs from an emission nebula in does not emit radiation of its own. It is a cloud of dust and gas that reflects the light energy from a nearby star or group of stars.Reflection nebulae are frequently the sites of star formation.hese colors are the result of different elements within the nebula. Most nebulae are composed of about 90% hydrogen, 10% helium, and 0.1% heavy elements such as carbon, nitrogen, magnesium, potassium, calcium, iron.
A nebula is a large cloud that consists of dust and gas. Their  massive size can be as wide as a trillion miles. A huge release of  gas in the interstellar medium produces t â¦ he nebula. The material  contained in the nebula collapses against itself and stars are  formed.hen a protostar is formed from the gas in a nebula, it is the  result of gravitational attraction. This attraction causes matter  to clump together until enough mass has ac â¦ cumulated that it  collapses in on itself and begins the process of fusion.