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Building solar panels in space using resources gathered in space, and beaming the electricity is an idea recently floated by ULA to create a space economy[1].
by peregrine 10y ago
Building solar panels in space using resources gathered in space, and beaming the electricity is an idea recently floated by ULA to create a space economy[1].
So it's not outside the realm of possibility.
[1] http://www.ulalaunch.com/uploads/docs/Published_Papers/Commercial_Space/2016_Cislunar.pdf http://www.ulalaunch.com/uploads/docs/Published_Papers/Comme...
- walrus01 10y agoRF/microwave engineer here: It would basically be a giant death ray in space, pushing that amount of energy through the air via microwave or laser is scary as shit. https://en.wikipedia.org/wiki/Space-based_solar_power#Microwave_power_transmission https://en.wikipedia.org/wiki/Space-based_solar_power#Microw...
- 1024core 10y agoThanks for pointing that out. I'm always amazed to see how many people don't understand the ramification of pushing gigawatts through air. People who are worried about birds getting killed by wind turbines? You have no idea what this much energy will do...
- walrus01 10y agojust wait until the space end's aim becomes misaligned...
- sbierwagen 10y agoTom Murphy wrote a good post on space-based solar a while ago: http://physics.ucsd.edu/do-the-math/2012/03/space-based-solar-power/ http://physics.ucsd.edu/do-the-math/2012/03/space-based-sola... Either the power density is high enough that it roasts anything crossing the beam path, or it's low enough that it's not appreciably higher than regular old sunlight flux.
- WorldMaker 10y agoRemains one of my favorite SimCity 2000 disasters.
- niels_olson 10y agoIsaac Asimov has a great short story about robots manning such a satellite. One had a glitch whereby he totally worshipped the sun and beaming the energy was the purpose of his "temple". He wouldn't let the humans interfere, which ostensibly violated the laws of robotics until they realized the robot was effectively committed to saving the earth. Found it: "Reason" https://en.wikipedia.org/wiki/Reason_(short_story) https://en.wikipedia.org/wiki/Reason_(short_story)
- milesward 10y agoAgreed. Don't beam, bury a superconductor in your Space Elevator tether cable. #wiresarenice
- walrus01 10y agoIf we're building space elevators, we could just cover the uninhabited desert parts of libya and algeria with hundreds of square km of photovoltaics...
- deleted 10y ago[deleted]
- outworlder 10y agoSee the same wikipedia page, under safety. > At the Earth's surface, a suggested microwave beam would have a maximum intensity at its center, of 23 mW/cm2 (less than 1/4 the solar irradiation constant), and an intensity of less than 1 mW/cm2 outside the rectenna fenceline (the receiver's perimeter).[82] These compare with current United States Occupational Safety and Health Act (OSHA) workplace exposure limits for microwaves, which are 10 mW/cm2,[83] - the limit itself being expressed in voluntary terms and ruled unenforceable for Federal OSHA enforcement purposes.[citation needed] A beam of this intensity is therefore at its center, of a similar magnitude to current safe workplace levels, even for long term or indefinite exposure.
- marshray 10y agoEven if we assume the conversion efficiency of microwaves are much better than solar, if the beam at its peak is less than 1/4 ordinary solar irradiation, why would this be more economical than ground-based solar?
- alexhill 10y agoIt would be available day and night and not as susceptible to weather fluctuations.
- jkaunisv1 10y agoSo Elon would be one step closer to Bond-level supervillain?
- peregrine 10y agoI 100% agree. I was just saying that ULA has floated the idea recently.