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The spectacular Trifid Nebula is bursting with new stars. The radiation from the stars that illuminate the nebula tend towards the blue part of the colour spectum. The nebula emission is caused by light from the young stars removing electrons from surrounding gas. When these electrons re-combine with the gas, light is emitted.

Situated in Sagittarius, it lies about 2200 light years away, in the direction of the centre of our Galaxy.