Orion Arm

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There is more information available on this subject at Orion Arm on the English Wikipedia.

In this diagram, the Orion Arm is labeled "Local Spur". The position of the Solar System is indicated by the yellow dot.

The Orion Arm is a spiral escalation of a minor spiral arm in the Milky Way galaxy. It is located near the galactic core and is part of the Sagittarius Arm (a major arm). It is also referred to as the Local Arm, Local Spur, or the Orion Spur. It is named "Orion" due to its proximity to the Orion constellation.^[1]

The Solar System and Earth are within and amid the Orion Arm. By 2490, UNSC colonial space encompassed over 800 planets and colonies ranging from small outposts to large, important military strongholds in the Orion Arm.^[2] The Covenant's area of inhabitants also includes a large portion of the Orion Arm. The Orion complex, the center of the Forerunner ecumene and the location of their homeworld Ghibalb, was also located in the Arm.^[3]