Habitable Zone

A Habitable Zone, Life Zone, or "Goldilocks Zone" is a planetological term for the area of stellar system space in which the right conditions for conventional life is thought to be most favorable.

• Imperial scientists often use the shorthand abbreviation HZ or Hz to indicate this term.
• Some also call it the green band.

Description (Specifications)

In practice, this zone tends to be a few planets out from the main star of a system, in which the conditions for liquid water, temperate weather, and other necessary conditions for conventional life can arise.

• Too far out, and liquid water no longer exists, meaning that only cryomorphs, or extreme cold species can survive.
• Too far in, and only thermomorphs, or extreme heat-loving species can survive.
• And of course, there are hundreds of other factors also involved.

Orbital Location of the Habitable Zone

The location of the HZ within star system is dependent on the category and class of the Star or Stars within the System and the placement of those Stars relative to each other. e.g. Two class M category V stars 100AU apart will make no difference to the Habitable Zones of each other - A class M main-sequence star orbiting a class A main sequence star just outside the Class A's habitable zone may have a number of planets that have habitable temperatures for all or part of their orbits.

Data for habitable zone distances by star type and category can be found in the Star Data Tables

History & Background (Dossier)

The idea of a Habitable Zone was independently developed by many different major and minor race sophont species.

• However, the one thing that most of these Charted Space species hold in common is that they are conventional carbon-based lifeforms. Their idea of habitability differs greatly from exotic or unconventional lifeforms such as Jovionoids.

See Also

Star systems

§ == ( Please refer to the following AAB Library Data for more information: ) == §

Star System

• Star
• Inner World
• Habitable Zone
• Outer World
• Remote System
• Far System

References & Contributors (Sources)

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.

• Marc Miller. Scouts (Game Designers Workshop, 1983), TBD.
• Joe Fugate. Grand Survey (Digest Group Publications, 1986), TBD.
• Geir Lanesskog. World Builder's Handbook (Mongoose Publishing, 2023), TBD.Joe Fugate, J. Andrew Keith, Gary L. Thomas. World Builder's Handbook (Digest Group Publications, 1989), TBD.
• Terrance McInnes, Dave Nilsen. World Tamer's Handbook (Game Designers Workshop, 1994), TBD.
• Jon F. Zeigler. First In (Steve Jackson Games, 1999), TBD.
• Marc Miller. T5 Core Rules (Far Future Enterprises, 2013), TBD.
• Author & Contributor: Lord (Marquis) and Master of Sophontology Maksim-Smelchak of the Ministry of Science