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

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 (incorrectly) uniform density.

Although the usual Dyson Sphere literature dotes on taking apart planets - particularly Earth for some reason, perhaps sociopathic authors - planets are hard, 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