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A grouping of systems, forming a chain of worlds, all reachable by a Jump-1 capable starship.

Description (Specifications)

This grouping provides a sort of “corridor” allowing jump-1 capable ships to travel to any world along the chain without ever exceeding jump-1.

  • Usually a Main encompasses 50 or more systems.
  • For ease of reference the main may be broken into arms, or branches.
  • Smaller groups of systems, between 5 and 50, all reachable by jump-1 are referred to as a trace or cluster.
Fundamental Astrographic Features
Type # Systems Definition Remarks
Main 51+ A very large grouping of systems None
Trace or Cluster 5 to 50 Smaller groupings of systems None

History & Background (Dossier)

Many such groupings of worlds exist in the Charted Space.

Mains & Branches

Star systems on long (51 or more stars) mains. Frequently are separated into arms or branches for identification purposes.

Prominent examples include:

Traces & Clusters

Star systems on smaller (5 - 50 stars) groupings. Most of these astrographic features are located in just one or two subsectors.

Traces & Clusters:

Other:

Mains of Charted Space

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About this image

Key

  • Yellow Dots: Star systems on long (51 or more stars) mains.
  • Blue Dots: Star systems on short (11 - 50 stars) mains.
  • Green Dots: Star systems not on any main (0 - 10 stars).
  • Red Lines: borders. Political borders.
  • Bright Blue Grid: sector borders. Organizational borders.
  • Dim Blue Grid: subsector borders. Organizational borders.

References & Contributors (Sources)

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This list of sources was used by the Traveller Wiki Editorial Team and individual contributors to compose this article. Copyrighted material is used under license from Far Future Enterprises or by permission of the author. The page history lists all of the contributions.