|
Size: 692
Comment:
|
Size: 1164
Comment:
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 3: | Line 3: |
| * Pro: Because it's there. * Con: Very little there. * Con: Hellishly expensive to get there. * Con: Nothing leaves. |
* Pro: Because it's there. * Con: Very little there. * Con: Hellishly expensive to get there. * Con: Nothing leaves (so far). |
| Line 8: | Line 8: |
| ||<-5> Very Little There || | ||<-5> '''Very Little There''' || |
| Line 12: | Line 12: |
| ||<-5> Resources || | |
| Line 14: | Line 15: |
| || gravity || gee || 1.0 || 0.38 || 0.38 || | |
| Line 16: | Line 18: |
| ||<-4>insolation (diameter/distance)^2 || 0.12 || | ||<-4>total insolation (diameter/distance)^2 || 0.12 || ||<-2>lethal perchlorates || not yet || yes || ~+∞+~ || || cosmic rays || rem/y || 0.03 || 10 to 20 || 500 || Phobos and Deimos are zero for the ratios, but easier to visit. 3 meters of local regolith shielding can easily be supported by a 6 psi (50/50 oxygen/helium ) balloon surface containing a 1 gee rotating habitat. |
Mars
- Pro: Because it's there.
- Con: Very little there.
- Con: Hellishly expensive to get there.
- Con: Nothing leaves (so far).
Very Little There |
||||
|
units |
Earth |
Mars |
Ratio |
Distance (avg) |
AU |
1.0 |
1.52 |
1.52 |
diameter (avg) |
km |
6371 |
3290 |
0.52 |
Resources |
||||
atmosphere mass |
kg |
5.2e18 |
2.5e16 |
0.005 |
water mass |
kg |
1.4e21 |
5e18 |
0.004 |
gravity |
gee |
1.0 |
0.38 |
0.38 |
note: Mars "water" mass may be smectite clay |
||||
|
||||
total insolation (diameter/distance)^2 |
0.12 |
|||
lethal perchlorates |
not yet |
yes |
∞ |
|
cosmic rays |
rem/y |
0.03 |
10 to 20 |
500 |
Phobos and Deimos are zero for the ratios, but easier to visit. 3 meters of local regolith shielding can easily be supported by a 6 psi (50/50 oxygen/helium ) balloon surface containing a 1 gee rotating habitat.