Today’s posting will fit into the general themes of the past couple of days, but will apply them to the issue of space development, which continues to be the focus of at least of cluster of brain cells when I have spare time.
One of the issues of the past few days has been the issue of externalities – people performing actions that threaten the life, health, and well-being of others without having to compensate those people for the costs. An industry that produces externalities allows the people involved in that industry to profit from the destruction of the things that are of value to other people. In some cases, it takes their lives.
One aspect of space development is that it is one area of industrial development that it can easily be designed to produce few externalities.
In space, we can expect energy to come primarily from two sources; photovoltaic (the use of solar cells to convert sunlight directly into energy), and solar concentration (the use of mirrors to focus solar energy on a reservoir that turns liquid into steam which turns a turbine. Both of these forms of energy production in space has significant advantages over similar systems on Earth. There are no clouds. There is no night. There is no atmosphere blocking the full force of the sun’s energy.
There are no CO2 emissions to contribute to global warming, no spent nuclear fuel rods that need to be disposed of, no windmills to clutter the landscape and chop up migrating birds, none of the problems with being able to produce energy only when the wind is blowing or the sky is clear, no building of huge reservoirs behind dams, or any of those effects.
There is a problem with getting the energy to those who use it. Some systems advocate beaming the energy down to Earth using microwaves. This would generate some potential externalities. Yet, I tend to think in terms of using the energy where it is harvested.
Space Mining and Manufacturing
A mining and manufacturing ship pulls up to an asteroid. A great many asteroids in space appear to be gravel piles held together by their own gravity. They are a loose collection of dust and rocks waiting to be turned into something useful.
A space manufacturing center would pull up to the asteroid, take these chunks of rock, feed them into a grinder to pulverize them, send them through a (solar powered) processing plant to extract the useful materials (oxygen, water, methane, ammonia, aluminum, iron), and spit the mine tailings out the other end.
However, in space, there is no such thing as a ‘waste product’. One of the things that we need in space is radiation shielding. Radiation shielding consists of think walls of anything you have available which can absorb the high energy particles that otherwise contaminate space. Two aluminum sheets with this space debris sandwiched in between would make useful radiation shielding.
So, everything has a use.
As far as providing for the needs of earth, one way to do so is not to beam energy down to the Earth’s surface, but to drop refined mining material onto the surface – huge chunk of iron or aluminum that has already been mined and refined without contaminating one iota of Earth’s delicate environment.
Where possible, these things can even be molded into their final form in space – into I beams and sheet metal or whatever other materials those living on the surface of the future earth may have a use for.
Externalities in Space
Space itself will have some externalities. The externalities we need to worry about include orbiting debris – bullets and cannonballs travelling at 17,500 miles per hour that are the remnants of spacecraft that have disintegrated, either accidentally or intentionally. Those countries who produce this rubble are forcing others to endure a cost – either the cost of shielding their people and materials, the cost of losing their people and materials, or the cost of not utilizing these resources. These are externalities where those who engage in debris-producing activities expect others to pay for the harm that these people do.
Launch and entry back into the atmosphere will have some effects on the atmosphere, owever, , but it would take a great many launches and entries to compare to the damage done by earth-based energy production, mining, and manufacturing. One of the most useful rocket fuels is a combination of liquid hydrogen and liquid oxygen – which produces water – which is hardly a dangerous chemical to be putting into the air.
I do not know the effects of bring materials back down from space. Over 100 tons of meteors hit the earth’s atmosphere every day, and that seems to produce no ill effects. It will take a while for people to be dropping 100 tons per day down to earth, yet everybody who is interested in space development hopes for the day that this benchmark is passed.
A third externality to be concerned with is obstructing the view. Currently, we can see satellites orbiting the earth. If you look out after sunset or before dawn, while the sky is dark, you can see the occasional satellite drifting across the sky, like an airplane. Now, we do not hear a great deal of concern about airplanes polluting the view of space at night (or of the sky in daylight), and no reason to hold that the sight of a satellite is in any way worse than the site of a plane in the sky.
In these cases, of the externalities we already know to expect, only one of them is a serious threat, that being the creation of orbital debris. Those externalities affect people who put things in space, but have no effect on the earth, other than creating a barrier that prevents people from exploiting space as a way of putting less stress on the Earth.
None of this should be considered a suggestion on what humans should try to accomplish in the near future. If that is the objection, then it misses the mark. I fully recognize that it would take a long time for space to reach this level of development. However, in that time, our need for space development might actually be higher than it is now. Over time, we are going to cut deeper and deeper scars into the living earth, unless we are pursuing alternatives that will allow us to leave the earth alone, to some extent.
However, like any investment, the sooner you start, the sooner you will see a return on your investment (if there is a return to be had). The sooner we invest in space-based energy production, mining, and manufacturing, the sooner we will have alternatives to cutting ever larger scars into the living earth.
As my birthday present, I would like to see the appropriate steps made in pursuing these options.
I am not asking for too much, am I?