Section Four: Worlds

 

Step 1: Planetary Size
Determine the size of each planet using the following modifiers;
Inner Orbit -10%
Middle Orbit +5%
Outer Orbit +10%
For mass Earth =1.0 or 6 million million million million Kgs.
Roll

Type

Diametre

 Mass Gravity
01-04

Asteroid/Planetoid Ring

under 1km

 0.00007 .007%
05-15

Asteroid/Planetoid Belt

under 200kms

 0.01 1%
16-20 Very Small   799km 0.06 6%
21-25

Small

2399km

 0.1 10%
26-30

Small

3999km

 0.3 30%
31-40

Small

5599km

 0.4 40%
41-45

Small

7199km

 0.5 50%
46-49

Medium 

 8799km  0.6 60%
50-55

Medium

10,399km

 0.8 80%
56-60

Medium 

11,999km

 0.9 90%
61-70

Earth standard  

 12,756km 1.0 100%
71-75

Large

 13,599km  1.1 110%
76-80

Large 

 15,199km  1.2 120%
81-85 Large 16,799km  1.3 130%
86-90

Small Gas Giant

 48,899km  16.0 1600%
91-95 Medium Gas Giant 120,199km 95.0 9500%
96-00

Large Gas Giant

 152,899km  318.0 31,800%
For comparison; Mercury is 4868kms; Venus is 12,103; Earth is 6378; Mars is 3400; Jupiter is 142,000; Saturn is 120,660; Uranus is 25,700; Neptune is 50,950; Pluto is 3500; and Charon is 1800kms.

 

Gravity is determined by the Mass of a planet, as listed above; it may be much higher or lower than these average examples, roll on the following table if you want some more variation.

MODIFIER
01-09 Minimal -40%
10-16 Extremely Light -30%
17-23 Very Light -20%
24-34 Light -10%
35-45 Medium -5%
46-76 Standard Normal
77-84 Strong +5%
85-90 Heavy +10%
91-95 Very Heavy +20%
96-98 Extremely Heavy +30%
99-00 Massive +40%

 

Step 2: Planetary Atmosphere
Determine the ecosphere of each planet.

Iceball
01-04

Total Vacuum.
05-10

Vacuum with tiny toxic gas trace.
11-14

Vacuum with very thin tainted toxic gas mix atmosphere escaping the planet.
15-20

Vacuum with very thin atmosphere escaping the planet.
21-24 Vacuum with corrosive thin atmosphere or toxic trace metals and gases.

Cool Temperate
25-30 Thin and tainted Oxygen/Nitrogen/Carbon Dioxide with toxic contaminants.
31-34 Thin Oxygen/Nitrogen/Carbon Dioxide.
35-40  Thin and corrosive as above with predominantly toxic trace metals and gases.
41-44 Thin and volatile Nitrogen/Carbon dioxide with combustible volatiles.
45-50  Standard glacial Oxygen/Nitrogen with minimal Carbon dioxide and high ozone.

Temperate - Variable
51-54 Standard and volatile Nitrogen/Carbon dioxide with fierce winds.
55-60 Standard Oxygen/Nitrogen with significant ozone component in stratosphere.
61-65 Standard and tainted Oxygen/Nitrogen with some contaminants.

Greenhouse Inferno
66-70 Standard and parched Oxygen/Nitrogen with minimal ozone and high Carbon dioxide.
71-74 Standard and corrosive Oxygen/Nitrogen with abundant toxic trace metals and gases.

Hellish Climate
75-80 Dense thick atmosphere which is predominantly oxygen and nitrogen.
81-84 Dense and tainted as before but with toxic contaminants.

Arctic Climate
85-90 Exotic mainly ammonia and methane.
91-95 Exotic and dense thick atmosphere of ammonia and methane.
96-00 Exotic and corrosive plethora of toxic trace metals and gases.

 

Step 3: Orbital Conditions
Determine the stability of the orbit of each planet around its star,
01-20 Very stable, circular orbit, very stable surface temperature.
21-40 Very stable, elliptical (oval) orbit, warmer twice every local year.
41-55 Very stable, very elliptical orbit, gets hot and cold twice every local year.
56-65 Slightly erratic, circular orbit, stable surface temperature changes gradually over thousands of years.
66-74 Slightly erratic, elliptical orbit, warmer twice a year, temperature changes rapidly over hundreds of years.
75-80 Slightly erratic, very elliptical orbit, hot and cold, temperatures become extreme every few years.
81-86 Very erratic, but circular orbit, temperature rises and cools every year by a few degrees.
87-90 Very erratic, elliptical orbit, hot and cold extremes twice a year vary by a few degrees each time.
91-94 Very erratic, very elliptical orbit, very hot and cold extremes, frequent storms, very harsh conditions.
95-98 Extremely erratic, retrograde (backwards) orbit, but stable, unpredictable temperature variations.
99-00 Extremely erratic, retrograde, elliptical orbit, unpredictable, harsh and violent temperature changes.

Stellar Orbit
Determine the length of time involved for the planet to rotate around its star.
.3 AU  50 +D10 days 
.4 AU 75 +D12 days
.5 AU 100 +2D10 days
.6 AU 130 +3D10 days
.7 AU 160 +4D10 days
.8 AU 200 +5D10 days
1 AU  300 +D100 days
2 AU 500 +D100 days
3 AU 900 +D100 days
5 AU 10 years +D20 months
6-20 AU AU x3 years +D12 months
21-40 AU AU x4 years +D12 months

Axis Spin

Determine the length of time involved for the planet to rotate on its own axis.
Gravity less than 1% to 200% D20 hours +D8 hours
Gravity 201% to 999% D20 hours
Gravity 1000%+ D12 hours

 

Step 4: Hydrographics
Even if there is no water, an ocean of any liquid element (hydrogen, ammonia, etc.) can still foster life.
01-10 Solid land with no surface water/liquid.
11-20 Only a few scattered seas or lakes, bound by land.
21-30 Single super continent with surrounding shallow ocean.
31-40 Standard, D4 large continents and many islands.
41-50 D4 small continents and many islands in deep oceans.
51-60 Single large continent and thousands of island groups.
61-70 Many small continents and islands with deep oceans.
71-80 Thousands of large and small islands in very deep oceans.
81-90 Covered in a world ocean with only a few, scattered island groups.
91-00 Completely covered by an unbroken ocean with no land above the surface.

 

Step 5: Available Resources

Roll D100 to determine percentage of each of the metals below present on the planet;
Magnesium, Aluminium, Silicon, Phosphorus, Sulfur, Chlorine, Argon, Potassium, Calcium, Scandium, Titanium, Vanadium, Chromium, Manganese, Iron, Cobalt, Nickel, Copper, Zinc, Rubidium, Strontium, Yttrium, Zirconium, Niobium, Molybdenum, Technetium, Rhodium, Palladium, Silver, Cadmium, Tin, Tellurium, Cerium, Promethium, Europium, Lutetium, Thorium, Uranium, Neptunium, Plutonium, Californium, Einsteinium, Nobelium, Tungsten, Iridium, Platinum, Gold, Mercury, Lead and Radium.

 

Step 6: Satellites

Roll D12 to determine how many moons; on 1-6 None, on 7-12 roll on the table below.
Planet Size Amount of moons
Small D4 -2
Medium D6
Large D12
Small Gas Giant D20
Medium Gas Giant 5D10
Large Gas Giant D100

 

"If you gaze for long into an abyss, the abyss gazes also into you"

Friedrich Nietzche
Index Cosmic Definitions Section 1: Dimensions
Section 2: Galaxies Section 3: Stellar Systems Section 4: Worlds
Section 5: Life Section 6: Civilisation