Difference between revisions of "Nebula"

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=== Selected Nebulae ===
 
=== Selected Nebulae ===
  
 +
# [[Anterior Cloud]]
 
# [[Basilisk Nebula]]
 
# [[Basilisk Nebula]]
 
# [[Block Nebula]]
 
# [[Block Nebula]]
 +
# [[The Cauldron]]
 
# [[Coalsack Nebula]]
 
# [[Coalsack Nebula]]
 
# [[Curtain Nebula]]  
 
# [[Curtain Nebula]]  
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# [[Dark Cloud]]
 
# [[Dark Cloud]]
 
# [[The Dark Nebula]]
 
# [[The Dark Nebula]]
 +
# [[Deimos Cloud]]
 
# [[Demon's Eye Nebula]]
 
# [[Demon's Eye Nebula]]
 
# [[Helix Nebula]]
 
# [[Helix Nebula]]
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# [[Hook Nebula]]
 
# [[Hook Nebula]]
 
# [[Horsehead Nebula]]
 
# [[Horsehead Nebula]]
 +
# [[Magister Cloud]]
 
# [[Inferno Nebula]]
 
# [[Inferno Nebula]]
 +
# [[Orion Nebula]]
 
# [[North American Nebula]]
 
# [[North American Nebula]]
 
# [[Pelican Nebula]]
 
# [[Pelican Nebula]]
 +
# [[Phobos Cloud]]
 
# [[Rim Reach Nebula]]
 
# [[Rim Reach Nebula]]
 
# [[Greater Shell Nebula]]
 
# [[Greater Shell Nebula]]
 
# [[Lesser Shell Nebula]]
 
# [[Lesser Shell Nebula]]
 
# [[Separe Cloud]]
 
# [[Separe Cloud]]
 +
# [[Shadow Cloud]]
 
# [[Spark Nebula]]
 
# [[Spark Nebula]]
 
# [[Verant's Head Nebula]]
 
# [[Verant's Head Nebula]]
 +
# [[Wisp Cloud]]
  
 
== History & Background ([[Dossier]]) ==
 
== History & Background ([[Dossier]]) ==

Revision as of 02:43, 19 January 2019

Comp-Prog-Dav-R-Deitrick-Starter-Trav-Page-16 16-July-2018a.jpg

A Nebula is an interstellar cloud of dust, hydrogen, helium and other ionized gases.

Description (Specifications)

Interstellar clouds are regions of gas, dust, and plasma that have a higher average density than the general interstellar medium. They are typically composed of about 70% hydrogen, the bulk of the remainder being helium with traces of other elements.

Basic Nebula Types

Interstellar clouds can be classified into 3 general types based on the primary form of hydrogen found within:

  1. Neutral Clouds (H I regions - formed of atomic hydrogen)
  2. Ionized Clouds (H II regions - formed of ionized hydrogen [i.e. "Plasma"])
  3. Molecular Clouds (Molecular Hydrogen - formed of H2)

Hydrostatic Equilibrium

Under normal circumstances interstellar clouds exist in a state of hydrostatic equilibrium, in which the natural self-gravitation that would otherwise cause the cloud to collapse is balanced by the outward pressure within the cloud due to motion of the atoms and molecules that compose it. Star formation is normally caused within molecular clouds by a triggering event which locally disturbs this equilibrium, causing runaway local collapsing regions within the cloud. Such causes can be the collision of one cloud with another, or the shock-wave within the interstellar medium caused by a nearby supernova explosion.

Selected Nebulae

  1. Anterior Cloud
  2. Basilisk Nebula
  3. Block Nebula
  4. The Cauldron
  5. Coalsack Nebula
  6. Curtain Nebula
  7. Lesser Curtain Nebula
  8. Dark Cloud
  9. The Dark Nebula
  10. Deimos Cloud
  11. Demon's Eye Nebula
  12. Helix Nebula
  13. Holowon Cloud
  14. Hook Nebula
  15. Horsehead Nebula
  16. Magister Cloud
  17. Inferno Nebula
  18. Orion Nebula
  19. North American Nebula
  20. Pelican Nebula
  21. Phobos Cloud
  22. Rim Reach Nebula
  23. Greater Shell Nebula
  24. Lesser Shell Nebula
  25. Separe Cloud
  26. Shadow Cloud
  27. Spark Nebula
  28. Verant's Head Nebula
  29. Wisp Cloud

History & Background (Dossier)

No information yet available.

Nebula Effects on Ships

Nebulae often interfere with sensors, especially commercial ship sensor suites. They can affect other ship equipment as well.

Nebula Size & Relative Location

Nebulae are typically measured in the following units:

Nebula Size & Relative Location
Size Typical Metrics Remarks
Astrographic Hex Parsec or AU These smaller nebulae are typically represented on a single astrographic hex.
Subsector Light-year or Deshi They are smaller nebulae by astronomic standards, but less than a subsector in size.
Sector Light-year or Deshi These are typical nebulae, often several subsectors in size. Some might be proto-galaxies, failed galaxies, or accreted star clusters... possibly the remants of a nova starburst.
Multi-Sector Light-year or Deshi These are truly massive nebulae, often several sectors in size.

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.
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