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Orbital photo of Serrana, a world-building experiment; a hybrid of Earth and Mars with small, isolated seas and extensive deserts and savanna. Orbital photo of Serrana, a world-building experiment; a hybrid of Earth and Mars with small, isolated seas and extensive deserts and savanna. Planetocopia: Tech Corner

by Chris Wayan, 2006

This page lists the physical details of Planetocopia's world-models. The chart shows only key factors affecting life; boldface flags unusual situations sculpting life on that world. Each world's home page has more details. In most columns Earth=1.


NAME MassDiam.GravTemp.Air pressure% O2 & avail. O2CO2: ppmSurface areaWater by vol% Land & Sea, and total land areaDay lengthCharacter
EARTH
as a
benchmark
1 12,750 km 1 G =
10 m/s,
5 m/s2
288°K
15°C
60°F
1 atm O2: 20%
Avail O2: 1
CO2 350 ppm 500 M km2,
196 M mi2
ca. 109 km3 26% land, 3% ice, 71% sea; ice-free land 52 M sq mi, 133 M sq km 24 hr day Interglacial. Many sentients; one ape has tech monopoly
TILT!
SEAPOLE 1 Earth mass 1 1 G 293°K
20°C
68°F
1 Atm O2: (20%),
avail O2 1
CO2 300 ppm
1 1 23% land, 77% sea; land area 0.85 Earths, 47 M sq mi, 120 M sq km 24 hr day Sea level up 110 m; mild maritime climate
SHIVERIA 1 Earth mass 1 1 G 283°K
10°C
50°F
Avg 1 atm
but up to 2 in Medit. Abyss
20% O2,
avail O2
2 in Abyss
CO2: 250 ppm 1 1 31% land, 7% ice, 62% sea; land area 1.2 Earths, 62M sq mi, 160 M sq km 24 hr day Ice; sea drops 140 m; sapient birds evolve in Mediterranean Abyss
TURNOVIA 1 Earth mass 1 1 G 288°K
15°C
59°F
1 atm O2 20%,
avail O2 1
CO2 250-300 ppm 1 1 27% land, 3.5% ice, 69.5% sea; land area 1.03 Earths, 54 M sq mi, 140 M sq km 24 hr day green Sahara, dry China, Scandinavian icecap
JAREDIA 1 Earth mass 1 1 G 286°K
13°C
56°F)
1 atm O2 20%,
avail O2 1
CO2: 300 ppm 1 1 28.5% land, 4.5% ice, 67% sea; land area 1.1 Earths, 57 M sq mi, 148 M sq km 24 hr day Tropical land belt, ice-free Antarctica
FUTURES
DUBIA 1 Earth mass 1 1 G 294°K
21°C
70°F
1 atm O2 22%
Avail O2
1.1
CO2: 700 ppm! 1 1 23% land, 77% sea; land area 0.85 Earths, 46 M sq mi, 119 M sq km 24 hr day Greenhoused!
Sea up 110 m
; coasts flooded, poles fertile
MARS REBORN 0.11 Earth mass 0.53 (6800 km) 0.38 G 282°K
9°C
48°F
Avg: 0.5
Hellas: 1
Tharsis 0.2
O2 30%.
Avail. O2: avg. 0.7
Hellas 1.5
CO2 3000 ppm 0.28
(140 M km2)
0.05? Ice imports probably unneeded 70% land, 30% sea; land area 0.7 Earths, 41 M sq mi, 105 M sq km 24.6 hr day terraformed; many sentient species
VENUS UNVEILED 0.8 Earth mass 0.95 (12,100 km) 0.9 G 298°K
25°C
77°F
3.6!
7.5% O2
avail O2 1.4
CO2 70 ppm? 0.9
(450 M km2)
0.3, all imported ice 25% land, 75% sea; land area 0.75 Earths, 44 M sq mi, 110 M sq km 336 hrs (14 days) terraformed, ring-shielded; dozens of sentient species
THE BIOSPHERE VARIATIONS
SERRANA 0.33 Earth mass 0.75 (9600 km) 0.65 G 292°K
19°C
66°F
0.67 atm
O2 21%
Avail O2 0.7
CO2:
900 ppm
0.56
(280 M km2)
0.07 55% land, 45% sea; land area 1 Earth! 59 M sq mi, 150 M sq km 16 hr day 6-8 sapients, cooperative anarchism
LYR 7 Earth masses 2.2
(29,600
km at equator)
tropics 1.23 G
poles 1.4 G
294°K
21°C
70°F
6 atm O2 12%
Avail O2 3.5
CO2:
150 ppm
5 Earths! (109 km2) 13 4.5% land, 95.5% sea; land area 0.75 Earths, 44 M sq mi, 110 M sq km 12 hr day Scattered lands in vast world-sea, 19 sapients (mostly fliers)
OISIN 0.04 Earth mass 0.39
(5000 km)
0.3 G 203°K
-70°C
-94°F
(air)
.034 atm 50% O2
Avail O2 0.1
CO2:
1200 ppm
0.15
(77 M km2)
0.2!
Wet, for a tiny moon
17% land, 83% sea; land area 0.2 Earths, 12.5 M sq mi, 33 M sq km 128 hr day Europa plus light! Abundant sea life under thin ice
THARN 0.25 Earth mass 0.66 (8300 km) 0.59 G trenches
27°C,
plains
17°C,
uplands
2°C
trenches
.4 to .5 atm
plains
0.24 atm
uplands
0.1 atm
21% O2
Avail O2:
trenches .5
plains .25
uplands 0.1
CO2:
3000 ppm
0.43
(216 M km2)
0.002! Dry! 1/500 of Earth's 94% land, 6% sea; land area 1.25 Earths, 74 M sq mi, 194 M sq km 48 hr day 13 sapients in Earthlike trenches and Martian uplands
PEGASIA 0.5 Earth mass 0.9 (11,300 km) 0.63 G 293°K
20°C
68°F
1.6 atm O2 22%
Avail O2: 1.76
CO2:
200 ppm
0.82
(415 M km2)
0.25 35% land, 65% sea; land area 1 Earth! 59 M sq mi, 150 M sq km 48 hr day Contest!
Invent the natives!
XANADU 0.06 Earth mass 0.48 (6120 km) 0.26 G 120°K
-153°C
-244°F
2 atm O2 0.1%.
Reducing atmosphere
CO2:
0 ppm
0.22
(115 M km2)
ethane not water
0.01
75% land, 25% sea; land area 0.57 Earths, 33 M sq mi, 86 M sq km 18 hr day Cold ecology, ethane not water: a wetter Titan
CAPSICA 0.45 Earth mass 0.75 (9600 km) 0.67 G 353°K
50°C
122°F
2.4 atm O2 21%.
Avail O2: 2.52
CO2:
600 ppm
0.5
(265 M km2)
0.1 50% land, 50% sea; land area 0.9 Earths, 55 M sq mi, 140 M sq km 30 hr day Earthlike uplands, HOT lowlands
LIBRATIA 1.15 Earth masses 1.12 (14,350 km) 0.915 G 283°K,
10°C, 50°F
dayside
22°C, 72°F
3.2 atm O2 16%
Avail O2: 2.5
CO2:
320 ppm
1.25
(625 M km2)
0.22 35% land, 42% sea, 22% ice; land area 1.5 Earths, 226 million sq km, 87.5 M sq mi 96 hrs rotation; day length infinite Tidelocked! Steamy patch, Earthlike ring, icy nightside
KAKALEA 1.52 Earth masses 1.12 (14,2950 km) 1.22 G 287°K
14°C
58°F
0.6 atm O2 16%.
Avail O2: 0.48
CO2:
450 ppm
1.25
(640 M km2)
.5 27% land, 65% sea, 8% ice; land area 1.3 Earths, 172 million sq km, 66.5M sq mi 18 hr day Earthlike, but mostly desert, sea and ice
CAPRICES
INVERSIA 1 Earth mass 1 1 G 286°K
13°C
55°F
Basins 1.8 atm, uplands .65 O2 24%
avail O2 2.2 in basins
CO2:
300 ppm
1 0.08 65% land, 35% sea; land area 2.25 Earths, 130 M sq mi, 330 M sq km 24 hr day Our continents are Inversia's seas
SIPHONIA 1 Earth mass 1 1 G 289°K
16°C
62°F
Deeps 1.6 atm, Uplands .7 O2: 20% CO2:
350 ppm
1 0.1? 60% land, 40% sea; land area 2.1 Earths, 120 M sq mi, 300 M sq km 24 hr day steamy, rugged abysses, cold ex-continents
ABYSSIA 1 Earth mass 1 1 G 293°K
20°C
68°F
1 atm O2: 22%;
avail O2 1.1
CO2:
300 ppm
1 1 12% land, 88% sea; land area 0.4 Earths, 23 M sq mi, 60 M sq km 24 hr day low island-continents in coral seas
SUMMARY
Extremes among the worlds, then the ratio between high & low Mass:
0.04 to 7.0
Ratio: 180!
Diam.:
0.39 to 2.2
Ratio: 5.64
Gravity:
0.26 to 1.41
Ratio: 5.4
Temp:
120°K to 323°K (-244 to 122°F)
Ratio: 2.69
Air pressure
0.034 to 6.0
Ratio: 176!
Oxygen:
0 to 24%
Avail O2:
0 to 3.5
CO2: 70 to 3000 ppm
Ratio: 43
Area: 0.15 to 5
Ratio: 33.3
Water: 0.002 to 13
Ratio: 6500!
Land: 4.5-94%
Ratio: 22
Land area:
0.2-2.25 earths
Ratio 11.25
Day: 12 to 336 hrs
Ratio: 28
Wide ranges of wet/dry, size, air pressure
Gravity and temp narrower.

A table like this is poetry to nerds like me. Well, more than poetry. Striptease! The illustrated web tours are like a floral-print dress; here are the naked numbers underneath. And I'm as shy about them as I am of my naked skin. Be gentle on me, O my Nerdish people! These figures are inevitably rough.

Be especially forgiving of the factors contributing to average temperature: insolation (solar output and mean distance), albedo (amount of sun absorbed: affected by the different reflectivity of clouds, bare rock, water, ice), and greenhouse effects (air pressure and content, especially methane, water vapor and CO2). I know what temperature I want; I'm crude about rigging the inputs to get it.

"Average worldwide temperature" can be deceptive. Some worlds have wide temperature spreads that the average conceals (Libratia); some are sharply two-tier (Inversia, Serrana, Siphonia and Capsica) or even three-tier (Tharn).

One apparent inconsistency isn't. CO2 levels don't always correlate with the strength of the greenhouse effect. If it looks wrong, check the total air pressure! 3,000 ppm of nothing much is still nothing much. Another culprit is insolation (solar energy), not listed above; several high-CO2 worlds are fairly far from their suns, preventing a runaway greenhouse effect: less sunlight to trap.

I have geographic doubts, too. As I've found better maps of Earth's sea floor and seen how rugged it is (and how most maps smooth it out) I've come to doubt my drier worlds have enough volcanoes on their basaltic plains. Worlds with extensive shallow seas, like Pegasia, should be richer in islands; those with wide dry plains, like Serrana and Tharn, should have more rain-catching, freestanding peaks and ranges. I over-relied on Venus's picture: many vents, but few high peaks. But Venus is so hot, the rock's more elastic and lava's slow to cool; so most volcanoes are broad and low. On my much cooler worlds, it ain't necessarily so. Rather than go back and alter the earlier worlds, Siphonia and Abyssia try to show Earth's true undersea complexity.

Photomontage by Wayan of 19 hypothetical planets and moons from space, ranging from 5000 to 30,000 km across.
WORLDS UNCHARTED... YET!

More essays on climatology and terraforming: More planetology, climatology and terraforming: A relief model of Io, Jupiter's volcanic moon


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