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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 not all dust. It is dust and gas and plasma. And It is the dust, gas, and plasma that makes a nebula beautiful. With regards to light source, there are two basic categories of nebula: emission nebula and reflection nebula. Emission nebulae are nebulae in which the ultraviolet light from a star is energizing the gas of the cloud. That causes the cloud to emit light. This is most often evident through emission of the color red, because of the abundance of hydrogen in the cloud.