NSSO on Space Based Solar Power 198
apsmith writes "About a year ago some of the people at the US National Security Space Office began looking into space-based solar power (SBSP) as a technology in the near-term strategic interests of the United States. At first the participants were skeptical, and the "phase 0 study" went along with no official funding. In a rather innovative move, they organized the study as a series of internet-based (bulletin-board and email) discussions, with the wordpress site open to the public, and a closed experts-only discussion using Google Groups. Initially expecting only a dozen or so interested parties, the discussion grew to include over 170 people with past expertise and interest in the issues. The final report was released Wednesday morning; it provides an excellent broad-brush review of the status of SBSP, showing immense potential, but also a number of challenges that appear only surmountable with a strong government commitment to the project. The big question is where it goes from here — NASA? DARPA? The new ARPA-E? Or something new? I was able to attend the press conference, which included Buzz Aldrin in an announcement of a new alliance to push for implementing the recommendations of the report."
Beyond the Orange-Bellied Parrot (Score:3, Interesting)
I like the idea of a separate organisation dedicated to this technology, as it's clear none of the existing organisations can do it. Set it in motion, get it done before the bloat sets in. Also like the idea of the solar-electric HEO ferry -- anyone have a link to an artist's perception of it (a real one I mean)?
Re:Ok, someone explain it to me (Score:2, Interesting)
Of course, I'm more of the belief that solar power satellites will not be practical until we have off earth resources to build them from and, as such, low tech heat exchange designs are a better solution than high tech solar panels as we might actually have a chance of making low tech stuff in space in the near term.
The difference between... cannot go wrong (Score:3, Interesting)
Lets build in some redundancy shall we? (Just in case.)
I think you covered the list pretty well but corrosion is also a factor that space should mitigate. Well, mostly aside from the wandering bit of space debris.
I haven't RTFA, probably won't, but I'd like to throw in the additional suggestion we look into Von Neumann devices to build most of the components on a lunar base. (Earth first, and strip-mine the moon later.)
Re:Beyond the Orange-Bellied Parrot (Score:3, Interesting)
That's the enormous potential lying just out there, and also something that almost justifies the apprehension that one can feel about nuclear weapons. Dark matter weapons would be to a nuclear weapon as a nuclear weapon is to fireworks. Of course, that's the same kind of problem that exists with any kind of space travel - anyone can get ahold of a big enough rock and manipulate existing forces send it towards anyone else to pose the kind of threat that would also make a joke of existing nuclear weapons.
But we can't stop threats - they come from nature just as much as they do from man. Learning how to face such danger is much more valuable than refusing to ever touch such ostensibly 'dangerous' forces. And I'd much rather have 10, then 100, then thousands of earths able to start up, rather than stagnating ourselves just to force this one earth to hold our entire future potential. Of course, that isn't the real choice we have either - in almost everyone's ideals, we should care for ourselves, care for eachother, and expand to be a peaceful force of diverse enlightenment rather than spending all our resources on war and revenge. We should care for our world, while we embrace the dangerous potential around us, so that we can grow to a point where the potential danger doesn't have to be so terrifying.
Ryan Fenton
Re:Ok, someone explain it to me (Score:4, Interesting)
And how exactly do you keep the power beam locked onto the target, when the target is on a sphere rotating once per day?
Putting them in equatorial geostationary orbits is *much* simpler. You'll lose a small amount of generating time each day (while the station is in Earth's shadow), but if you schedule as much of your maintenance as possible during this time, the effect is minimal.
And maintenance *will* be required, for the foreseeable future. Someday we may be able to build solar cells that don't need to be periodically replaced, but not today.
Furthermore, it's been noted that Earth orbit is "halfway to anywhere in the solar system" (attributed to Heinlein). So we'll need serious orbital capability to build these things, regardless of where we put them.
Re:Ok, someone explain it to me (Score:2, Interesting)
If you really lose 50% in transmission *and* 50% in receiving the case is harder to make - most estimates seem to have higher numbers for overall system end-to-end efficiency, but of course nobody's buit one yet.
Actually, I'm quite sure someone has built an earth bound a set of devices capable of comparable beam energy density to a proposed orbit power system. IIRC, the efficiency of the receiving antenna can be around 90%, not sure about that of the transmitter.
Personally, I'm sure an array of heat engines could provide more power density than currently comparably priced solar panels, it's silly to pass them up.
Re:Because you don't need batteries... (Score:3, Interesting)
Re:Beyond the Orange-Bellied Parrot (Score:2, Interesting)