Planet

World Generation Plugin for Fuzion

Step 3: Physical Characteristics

Conversions

Mass
1 Earth = 5.98x1024 kg

Diameter
1 Earth = 12,756.3 km

Density
1 Earth = 5520 kg/m3

Orbit
1 AU = 149,600,000 km

Step 3a: World Type

First, determine the type of world that should be created. Roll 3d6 and consult the following table:

Roll (3d6) Inner Zone Bio Zone Outer Zone

3

empty orbit

empty orbit

empty orbit

4

empty orbit

rock ball

rock ball

5

empty orbit

asteroid belt

rock ball

6

empty orbit

asteroid belt

asteroid belt

7

greenhouse

pre-garden

asteroid belt

8

greenhouse

pre-garden

gas giant

9

greenhouse

garden

gas giant

10

greenhouse

garden

gas giant

11

rock ball

garden

gas giant

12

rock ball

post-garden

desert

13

rock ball

post-garden

desert

14

rock ball

desert

glacier

15

asteroid belt

desert

ice ball

16

asteroid belt

rock ball

ice ball

17

asteroid belt

gas giant

failed core

18

asteroid belt

gas giant

failed core

In some cases, the GM may wish to select a world of the appropriate type, if appropriate (for example, if the campaign calls for a garden world, then the GM can choose to place a garden world in the bio zone, rather than rely on the luck of the dice).

The different world types are described below:

Rock Ball:
Rock balls are airless worlds.

Ice Ball:

Gas Giant:
Gas giants orbit stars in the outerpart of their star systems. Gas giants are huge: the smallest are at least 10 times the mass of Earth, and the largest, the mass of 800 Earths. Gas giants are made of hydrogen, helium, methane and ammonia. Below the immensely deep atmosphere, the pressure turns the world's gases into liquid.

Greenhouse:

Glacier:

Pre-Garden:

Garden:

Post-Garden:

Desert:

Failed Core:

Asteroid Belt:

optional rule — unusual worlds

Step 3b: Diameter

For gas giants and other planets, determine the diameter as follows:

World Type Diameter

Gas Giants

3D6 x 2

Ice or Rock Ball

3D6 / 100

Other Planets

3D6 / 10

This diameter is measured in "Earths". To convert to kilometers, multiply by 12,800 km.

Step 3c: Density

First determine the componsition of the planet:

World Type Composition
Rock ball rock
Ice ball ice
Gas Giant gas
Greenhouse roll on table
Glacier ice
Pre-garden roll on table
Garden roll on table
Post-garden roll on table
Desert roll on table
Failed core roll on table
 
Roll (1d6) Composition

1

solid core

2-4

molten core

5-6

rock

Next, roll 3d6, and consult the following table to find the density:

Roll (3d6) Solid Core Molten Core Rock Ice Gas
3 1.14 0.82 0.50 0.18 0.10

4

1.16

0.84

0.52

0.20

 0.11

5

1.18

0.86

0.54

0.22

 0.12

6

1.20

0.88

0.56

0.24

 0.13

7

1.22

0.90

0.58

0.26

 0.14

8

1.24

0.92

0.60

0.28

 0.16

9

1.26

0.94

0.62

0.30

 0.18

10

1.28

0.96

0.64

0.32

 0.20

11

1.30

0.98

0.66

0.34

 0.22

12

1.32

1.00

0.68

0.36

 0.23

13

1.34

1.02

0.70

0.38

 0.24

14

1.36

1.04

0.72

0.40

 0.26

15

1.38

1.06

0.74

0.42

 0.27

16

1.40

1.08

0.76

0.44

 0.28

17

1.42

1.10

0.78

0.46

 0.29

18

1.44

1.12

0.80

0.48

 0.30

The density on this table is measured in "Earths" -- thus, the Earth has a density of 1.0

Step 3d: Gravity

The gravity on a planet can be determined as follows:

Gravity = Diameter * Density

Step 3e: Mass

The mass of a planet can be determined as follows:

Mass = Diameter3 * Density

Step 3f: Axial Tilt

Roll (2d6) Tilt
2-5 Very little 1D6-1 deg
6-8 Slight 3D6+3 deg
9-10 Standard (Earthlike) 3D6+19 deg
11 High 3D6+35 deg
12 Extreme 50-90 deg

Step 3g: Albedo

Copyright © 1999 by B.C. Holmes. Last updated November 6th, 1999.
Fuzion copyright © the Fuzion Group, 1997. All rights are reserved.
Star Hero and Hero Games are registered trademarks of Hero Games. All rights reserved.

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