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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 cloud of gas or dust in space that may reflect light emanating from nearby stars. 'Nebulae' is just the plural form of 'nebula.' A nebula is the location of where something called the interstellar medium (ISM) is densest.n emission nebula is a glowing cloud of ionized gas that is excited by ultraviolet radiation absorbed from hot nearby stars. Such a star must be hotter than 25,000 K to emit enough UV radiation to ionize the gas. When a gas is ionized, it's excited and produces an emission spectrum with a distinct pink color.