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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.
These moons are all composed primarily of water ice, and are believed to be differentiated into a rocky core and an icy mantle and crust. The Large Outer Moons, which orbit outside of the Saturnâs E Ring, are similar in composition to the Inner Moons â i.e. composed primarily of water ice and rock. At 5150 km in diameter, and 1,350Ã10 20 kg in mass, Titan is Saturnâs largest moon and comprises more than 96% of the mass in orbit around the planet.