Nebulae

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Outer layers of gas from an expired red giant. Shape and colour depend on the size, composition of the Sun and its direction to us from Earth.
Clouds of high temperature gas, warmed by ultraviolet radiation, ionized electrons emit further radiation. Often indicators of newly born formed stars.
Gas and dust that block off the light from the stars behind them Appear as a dark patch against the starry background. Also called Dark Nebulae.