The Sidereal Wall

The Sidereal Wall is a vast expanse of stars located at the very root of the Norma-Outer Arm, that travelers crossing the Norma Expanse encounter when heading coreward.[1]

Prior to the development of hyperspace technology, astronomers could not verify that the Norma Arm observed east of the galactic core, and the Outer Arm observed west of the galactic core where in fact part of the same spiral structure. The discovery of the Boreas region by early deep-space explorers changed this, resulting in the entire spiral structure being renamed to the Norma-Outer Arm.

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