Technology

Otoh according to Iain Banks's speculation, space colonisation might be the thing that finally lets humanity toss off the chains of capitalism:

The thought processes of a tribe, a clan, a country or a nation-state are essentially two-dimensional, and the nature of their power depends on the same flatness. Territory is all-important; resources, living-space, lines of communication; all are determined by the nature of the plane (that the plane is in fact a sphere is irrelevant here); that surface, and the fact the species concerned are bound to it during their evolution, determines the mind-set of a ground-living species. The mind-set of an aquatic or avian species is, of course, rather different.

Essentially, the contention is that our currently dominant power systems cannot long survive in space; beyond a certain technological level a degree of anarchy is arguably inevitable and anyway preferable.

To survive in space, ships/habitats must be self-sufficient, or very nearly so; the hold of the state (or the corporation) over them therefore becomes tenuous if the desires of the inhabitants conflict significantly with the requirements of the controlling body. On a planet, enclaves can be surrounded, besieged, attacked; the superior forces of a state or corporation - hereafter referred to as hegemonies - will tend to prevail. In space, a break-away movement will be far more difficult to control, especially if significant parts of it are based on ships or mobile habitats. The hostile nature of the vacuum and the technological complexity of life support mechanisms will make such systems vulnerable to outright attack, but that, of course, would risk the total destruction of the ship/habitat, so denying its future economic contribution to whatever entity was attempting to control it.

Outright destruction of rebellious ships or habitats - pour encouragez les autres - of course remains an option for the controlling power, but all the usual rules of uprising realpolitik still apply, especially that concerning the peculiar dialectic of dissent which - simply stated - dictates that in all but the most dedicatedly repressive hegemonies, if in a sizable population there are one hundred rebels, all of whom are then rounded up and killed, the number of rebels present at the end of the day is not zero, and not even one hundred, but two hundred or three hundred or more; an equation based on human nature which seems often to baffle the military and political mind. Rebellion, then (once space-going and space-living become commonplace), becomes easier than it might be on the surface of a planet.

Even so, this is certainly the most vulnerable point in the time-line of the Culture's existence, the point at which it is easiest to argue for things turning out quite differently, as the extent and sophistication of the hegemony's control mechanisms - and its ability and will to repress - battles against the ingenuity, skill, solidarity and bravery of the rebellious ships and habitats, and indeed the assumption here is that this point has been reached before and the hegemony has won... but it is also assumed that - for the reasons given above - that point is bound to come round again, and while the forces of repression need to win every time, the progressive elements need only triumph once.

Concomitant with this is the argument that the nature of life in space - that vulnerability, as mentioned above - would mean that while ships and habitats might more easily become independent from each other and from their legally progenitative hegemonies, their crew - or inhabitants - would always be aware of their reliance on each other, and on the technology which allowed them to live in space. The theory here is that the property and social relations of long-term space-dwelling (especially over generations) would be of a fundamentally different type compared to the norm on a planet; the mutuality of dependence involved in an environment which is inherently hostile would necessitate an internal social coherence which would contrast with the external casualness typifying the relations between such ships/habitats. Succinctly; socialism within, anarchy without. This broad result is - in the long run - independent of the initial social and economic conditions which give rise to it.

Well at least there aren't any natives we'd be oppressing this time.

It's like the rings of Saturn: the likelihood of a collision is so remote that they didn't even consider it when we had a satellite move through it.

I didn't realize that, what mission is this your talking about? Cassini?

Pretty sure its the asteroid belt, not planetary rings, that you don't really need to think about when passing through.

And yeah, it shouldn't be too hard and yet look at all the junk already up there. Hopefully they can just be required to keep to very low orbits that decay rapidly.

There are three modes of heat transfer; conduction, convection, and radiation.

Conduction happens when two bodies at different temperatures come into contact with each other. The total heat transfer depends primarily on the difference in temperature, contact surface area and time spent in contact.

Convection takes place when a fluid (I.e. a gas such as air or a liquid such as water) comes into contact with another body. Here, again, heat transfer depends on difference in temperature, contact ("wetted") surface area and time in contact which is primarily dictated by how fast the fluid is moving over the body.

On Earth we generally leverage these two modes. An example of mixing the two modes is a CPU heatsink and fan setup. The heatsink conducts heat away from the CPU and is (usually) distributed throughout several extended surfaces I.e. fins. The fins increase the surface area in contact with air, enhancing the rate of heat transfer.

Now, we can't really take advantage of those in space. The lack of an independent physical medium means the heat ultimately has no where to go; this is known as a "closed system". So if we generate or store enough heat in a body subject to the void of space without promoting radiative heat transfer, that heat will more or less stay put.

Radiative heat transfer is fucked up. Everything above absolute zero radiates heat. You mostly can't see this except for one glaringly obvious example; the Sun. Sol is so fucking hot that it heats the Earth through the vacuum of space purely via anger aka photons. And thanks to the miracle of science, you radiate anger right back at it.

Explaining radiative heat transfer further is outside the scope of this reply and will be left as an exercise to the reader.

I hope I explained this well enough for you or other readers to impart a 'basic' idea of a complex engineering discipline that I adore. I'm absolutely willing to answer any questions.