Stady Materials

Materials in solar system for Stapledon-Dyson Static-Dynamic 50 AU Shell, 60K

Source Planets and Moons

		Velocity km/s
Object	Mass kg	Orbit	Escape	Center	Temp K	Composition
Mercury	3.30e23	47.4	4.25	47.7	85-700	iron core, silicate mantle
Venus	4.87e24	35.0	10.4	37.3	737	?
Asteroids	3.xxe19	16-20	< 0.51	16-20	85-270	some iron, silicates
Jupiter	1.90e27	13.1	59.5	74.0	112+	H, He, some core rock
Callisto	1.08e23	8.2	2.0	15.6	80-165	H₂O and rock
Saturn	5.68e26	9.7	35.5	44.5	84-134	H, He, some core rock
Titan	1.34e23	5.6	2.6	11.6	94	H₂O and rock
Uranus	8.68e25	6.8	21.3	27.0	47-76	H, He, 2.3% methane
Titania	3.53e21	3.6	0.8	7.8	60-89	H₂O, organics, rock
Neptune	1.02e26	5.4	23.5	29.3	55-72	H, He, trace methane
Triton	2.14e22	4.4	1.5	7.2	38	H₂O and rock

The energy to escape from the center of the planet is 1.5 times the surface escape velocity, assuming (optimistically) uniform density. "Center" is the escape velocity from the center of the planet to solar escape.

Although the usual Dyson Sphere literature dotes on taking apart planets - particularly Earth for some reason, perhaps sociopathic authors - big planets are difficult to use, especially if the good stuff is deep inside, and not beneficiated by plate tectonics and ocean/biological chemistry. Asteroids are prefractured planetesimals, and many are threats to the Earth and ought to be removed. Uranus is better than Neptune as a source of carbon, more carbon (in methane), easier to get to, 60% more solar energy.

Abundance

Element	ppm by weight
Oxygen	10,000
Carbon	4,600
Iron	1,000
Silicon	650

Resistivity

Element	e-8 Ω-m, imprecise estimates					Graph
	300 K	TC /K	≃ 80 K	73 K	53 K	60 K
Silver	1.6		0.33	0.28	0.15	0.19
Copper	1.7	0.004				0.11
Aluminum	2.8	0.004	0.28	0.33	0.20	0.22
Iron	10.0	0.005	0.74	0.62	0.27	0.35

StadyMaterials

Stady Materials

Materials in solar system for Stapledon-Dyson Static-Dynamic 50 AU Shell, 60K

Source Planets and Moons

Abundance

Resistivity