Stellar Density

Stellar Density refers to the number of stellar systems contained within a volume of space, usually within a Sector.

Specifications

The average density in the spiral arms is 500 to 650 World-Systems per sector, which works out to 40-50%. Overall galactic stellar density remains lower than that of individual spiral arms. Galactic stellar densities are affected by astronomic morphology and non-spiral galaxies often hold much different make-ups. A number of other factors may affect galactic stellar density. Rifts or void areas have a very low density of stars, not a complete absence.

This map shows the stellar density of each sector in Charted Space.

There is also a stellar density map by subsector over the Imperium.

Charted Space Sector Density

	-9	-8	-7	-6	-5	-4	-3	-2	-1	0	1	2	3	4	5	6	7	8
5	---	---	---	---	317	272	184	266	271	341	227	258	304	352	253	40	367	---
4	---	---	---	---	391	459	332	275	370	398	298	257	319	446	96	198	457	---
3	---	350	438	658	466	500	342	385	243	362	519	330	425	453	149	133	241	---
2	---	395	554	575	487	359	374	327	223	425	446	418	318	344	259	371	322	---
1	---	397	434	271	366	439	386	267	532	601	553	314	151	512	---	537	305	---
0	---	269	375	617	459	327	123	533	560	531	517	387	283	450	---	---	500	---
-1	---	407	228	264	158	108	234	451	496	516	346	350	417	626	514	465	377	---
-2	74	19	20	55	166	393	400	366	453	476	426	435	478	431	427	435	412	---
-3	21	49	170	490	487	472	410	485	516	400	486	451	438	429	439	432	417	---
-4	---	401	484	495	423	515	354	373	393	299	293	220	414	367	406	420	207	---
-5	---	278	362	351	444	564	459	265	237	489	451	439	---	650	609	421	---	---
-6	---	---	---	---	---	---	---	---	419	492	---	---	---	---	561	546	---	---

Notes: "---" = No known record of stellar density in the sector.

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Stellar Density Key

Milky Way Galaxy

Average Stellar Density

Designation	Range	Remarks
Very Dense	800+ Stars	Stellar Core Extreme population I
Dense	700-799+ Stars	Typical galactic distribution near Zone I Disc population I/II
Very High	600-699 Stars	Typical galactic distribution near Zone I Intermediate population I
High	500-599 Stars	Typical galactic distribution near Zone II Intermediate population II
Average	400-499 Stars	Typical galactic distribution near Zone II Intermediate population III
Low	300-399 Stars	Typical galactic distribution near Zone II Intermediate population IV
Very Low	200-299 Stars	Typical galactic distribution near Zone III Halo population I
Sparse	100-199 Stars	Typical galactic distribution near Zone IV Halo population II
Very Sparse	< 100 Stars	Near Void and/or deep space

---

Zhodani Core Expedition Stellar Density

Zhodani Core Route sectors

	-7
25	141
24	108
23	264
22	654
21	651
20	640
19	647
18	600
17	642
16	649
15	652
14	636
13	657
12	648
11	641
10	633
9	646
8	543

Stellar Density Table

Stellar Density Table

IISS T5SS Protocols (v.1720.21c / pg. 421)

ZT	Zone Type (ZT)	Designation	%	Subsector Range	Sector Average	Sector Range	Remarks
AV	Absolute Void	Empty	0%	0 worlds	0 worlds	0 worlds	Absolutely empty of significant planetary objects.
EG	Extra-Galactic	Very Sparse	1-2%	1 world	6 worlds	1 to 37 worlds	Rogue planets and other galactic ejecta. The stars are so few in this zone and it is nigh impossible for low capability FTL engines to traverse Extra-Galactic Space. Extra-Galactic Space is practically impossible for lower technology civilizations to traverse.
IntG	Rift	Sparse	3-6%	2 to 5 worlds	38 worlds	38 to 215 worlds	Rifts are the mostly empty places within a galaxy structure. The stars are very few in this zone and it is almost impossible for low capability FTL engines to make their way around. Rifts are significant barriers to interstellar travel for lower technology civilizations.
IntG	Spare	Very Low	7-32%	6 to 25 worlds	216 worlds	216 to 419 worlds	Spare zones begin to form aggregate planetary masses. The stars are very spare in this zone and it is very difficult for low capability FTL engines to make their way around.
IntG	Scattered	Low	33-49%	26 to 39 worlds	420 worlds	420 to 639 worlds	Scattered zones contain significant planets and have significant potential for conventional life. The stars are scattered in this zone and it is difficult for low capability FTL engines to make their way around.
IntG	Standard	Average	50-65%	40 to 52 worlds	640 worlds	640 to 839 worlds	Standard zones contain a goodly number of planets and have good potential for conventional life. The stars are moderately dense in this zone and it is a little challenging for low capability FTL engines to make their way around.
IntG	Dense	High	66-82%	53 to 65 worlds	840 worlds	840 to 1,059 worlds	Dense zones contain a lot of planets and have very good potential for conventional life. The stars are dense in this zone and it not difficult for low capability FTL engines to make their way around.
IntG	Cluster	Very High	83-90%	66 to 72 worlds	1,060 worlds	1,060 to 1,169 worlds	Cluster zones contain many planets and have great potential for conventional life. The stars are very dense in this zone and it is easy for low capability FTL engines to make their way around.
IntG	Core	Dense	91-100%	73 to 80 worlds	1,170 worlds	1,170 to 1,280 worlds	Core zones contain many, many planets, but the density and radiation make conventional life very difficult. The stars are so dense in this zone that even the least capable FTL engines can easily make their way around.
IntG	Full	Very Dense	100%	80 worlds	1,280 worlds	1,280 worlds	The maximum number of star systems possible within the specified area.

• IntG = Intragalactic Space.

References and contributors

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 Mongoose Publishing or by permission of the author. The page history lists all of the contributions.

• Author & Contributor: User:77topaz
• Author & Contributor: User:Tjoneslo
• Author & Contributor: Lord (Marquis) and Master of Sophontology Maksim-Smelchak of the Ministry of Science