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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 bunch of atoms and molecules floating in outer space, like a cloud of dust. More than one nebula are called nebulae, because-ae is the plural ending in Latin, just as-s is the plural ending in English.Nebula is the Latin word for a cloud.ventually, inside some nebulae, the dust thickened in some places enough to form new stars, or to form planets around those stars. New nebulae are still forming today, whenever a star explodes into a supernova. One example is the Crab Nebula, which formed in 1054 AD.