M42 is universally known as The Great Orion Nebula, and form togheter with other nebulas and open star clusters the Sword of Orion. The Orion Nebula was known from antiquity, being a bright object easily visible to the naked eye under dark skies. The nebula contains regions of emitting gases, and others which reflects the starlight: the colors that can be revealed with long exposure images are outstanding. This object is probably one of the most imaged in both the emispheres. However, it is not an easy target, because the brightness difference between the center and the edges is enormous. Today, applying digital techniques help greatly the astroimagers to solve this problems.

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