Orion Spur
The Orion Spur (a.k.a the "Orion-Cygnus Spur" or "Orion Arm", or "Local Arm") is a "spur" of stars branching off one of the larger spiral arms of Galaxias, measuring a little over 1000pc in width and a little over 6000pc in length.
- It is the part of Galaxias (a.k.a. the "The Milky Way") that contains all of the stars of Charted Space.
- The stars of Charted Space lie roughly half-way down the spur lengthwise (~ 3000pc) along the inner (coreward) edge, near the mean galactic plane.
Description (Specifications)[edit]
LOCAL GALACTIC STRUCTURE:
The Local Region of Charted Space lies along the inner (coreward) edge of the Orion Spur slightly North of the mean galactic plane (on average). Scientists currently debate as to whether the Orion Spur is in fact a rimward Spur of the Sagittarius-Carina Arm, or whether the Local Arm is actually a more substantive minor arm of its own (the Orion Arm) that is a coreward split from the Perseus Arm. What is certain is that the Orion Arm/Orion Spur lies between the Sagittarius-Carina Arm proper to Coreward, and the Perseus Arm to Rimward, separated from each by a span of lower stellar-density rift.
The Vela Molecular Ridge is a series of overlapping emission and absorption nebulae of active star formation (including the Vela OB2 Association at its near end and the Vela OB1 Association at its distant end) lying further down the center and coreward edge of the Orion Spur to trailing of Charted Space at a distance spanning approximately 500pc to 1500pc, and lying approximately 1000pc core-spinward of the Empty Stars Region (including the Distant Fringe sub-region), which is itself a vast expanse of stellar wilderness lying approximately 1800pc to rim-trailing of Charted Space along the outer edge of the Orion Spur.
The Cepheus Region lies between approximately 600-1500pc from Charted Space along a rim-spinward bearing along the outer edge of the Orion Spur and contains the star-forming region known as the Cepheus Molecular Cloud, which includes both the Cepheus OB2 and Cepheus OB3 Associations.
Image Repository[edit]
TravellerMap (T5SS):
[1]
Local galactic topography (Orion Arm):
History & Background (Dossier)[edit]
The stars of Charted Space lie roughly half-way down the Orion Spur lengthwise (~ 3000pc) along the inner (coreward) edge of the arm, only a few parsecs North of the mean galactic plane on average. Almost the entirety of the trailing polities of Charted Space largely lie within what is known as the Rho Ophiuchi Molecular Cloud Complex, and in particular are part of the Scorpius-Centaurus Association.
Other settled regions of the Orion Spur include:
- The Empty Stars Region (including the Distant Fringe sub-region) is a vast expanse of stellar wilderness lying approximately 1800pc to rim-trailing of Charted Space along the outer edge of the Orion Spur that is reported to have sporadic settlements.
- The Markhab Sector within the greater Markhab Region lies approximately 4800 parsecs spinward of Charted Space, closer to where the Orion-Cygnus Spur (the "Local Arm") splits from its more prominent parent arm of Galaxias.
See also[edit]
Cosmology[edit]
- Cosmology & Astrophysics:
- Anomaly
- Galaxy
- Jumpspace
- Light Speed
- Nebula
- N-space (Einsteinian Spacetime)
- Pocket Universe
- Singularity:
- Cosmological: Big Bang
- Gravitational: Black Hole
- Space
- Universe
- Milky Way Galaxy (Galaxias / Dakhaseri)
Astrography & Travelling in Charted Space
- Astrography
- Physical Astrography
- Exotic Astrography
- Ellipsoid
- Ringworld
- Rosette
- Sphereworld (Dyson Sphere)
Astrography Metadata
- Astrographic History
- Astrographic Software
- Sector File Format
- Stellar Data
- Traveller Map
References & Contributors (Sources)[edit]
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- Contributor: WHULorigan