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Ultra-lite space mirror could change astronomy and allow (cheap) total global surveillance
Cheap, of course, being a relative judgement. ETA: This is in the EE forum because, even though not mentioned, there are possible implications for space-based solar power.
DARPA’s mirror-killing membrane could change astronomy, allow total global surveillance
By Graham Templeton on December 6, 2013
When it launches in 2018, the James Webb Space Telescope will let us see deeper into the universe than ever before. Its enormous eye is centered around 18 octagonal mirrors which assemble to form the largest telescope mirror ever built, but someday even the James Webb Telescope (formerly the Next-Gen Space Telescope) will outlive its usefulness — and then what will we do? The obvious answer is to launch an even more advanced telescope, one with an even bigger mirror that can focus on even more distant or difficult light. There’s just one problem: given the costs and practical barriers to launching objects into space, it’s very possible that in this case simply going bigger may be impossible.
That’s where DARPA comes in. The agency has always liked playing smarter — rather than harder — and has a stated goal of allowing its government to view any point on the planet, instantly and in real-time. That being the case, they needed to develop a way of launching surveillance satellites much more cheaply. DARPA has looked into everything from satellite miniaturization to Hyperloop style drone throwers, but a satellite’s mirror is the hardest part to launch in most cases. In a move sure to excite cash-strapped astronomers and terrify nervous libertarians, DARPA now says it could have a way around that problem, making high-fidelity space cameras much quicker and cheaper to launch.
Called MOIRE, or Membrane Optical Imager for Real-Time Exploitation, the project looks to replace one of the heaviest and most troublesome elements in astronomy. Rather than using enormous mirrors or thick, dense lenses to reflect or refract the light into a collector, MOIRE uses membranes about as thick as kitchen plastic wrap to diffract light onto the satellite’s collector. MOIRE will launch in a compact state, its version of a mirror mounted on the front in the form of folded, concentric “petals” of this membrane. When the mission reaches its destination, these petals will unfold into huge sails, providing a focusing element larger than any mirror could realistically be. A MOIRA satellite launched at 6.5 meters in diameter, roughly the size of the James Webb mirror, could unfurl to a diameter of more than 21 meters.
That’s a big deal, since the diameter of a telescope’s focusing device determines its maximum resolution. If you want to look into the very beginnings of the universe or into its most elusive and subtle elements, you need a big mirror, or at least a mirror analog. If you want to view close-up video of a spot on Earth roughly 35,000 kilometers below, you need a big mirror, too.
These membranes aren’t just physically smaller and lighter
By Graham Templeton on December 6, 2013
When it launches in 2018, the James Webb Space Telescope will let us see deeper into the universe than ever before. Its enormous eye is centered around 18 octagonal mirrors which assemble to form the largest telescope mirror ever built, but someday even the James Webb Telescope (formerly the Next-Gen Space Telescope) will outlive its usefulness — and then what will we do? The obvious answer is to launch an even more advanced telescope, one with an even bigger mirror that can focus on even more distant or difficult light. There’s just one problem: given the costs and practical barriers to launching objects into space, it’s very possible that in this case simply going bigger may be impossible.
That’s where DARPA comes in. The agency has always liked playing smarter — rather than harder — and has a stated goal of allowing its government to view any point on the planet, instantly and in real-time. That being the case, they needed to develop a way of launching surveillance satellites much more cheaply. DARPA has looked into everything from satellite miniaturization to Hyperloop style drone throwers, but a satellite’s mirror is the hardest part to launch in most cases. In a move sure to excite cash-strapped astronomers and terrify nervous libertarians, DARPA now says it could have a way around that problem, making high-fidelity space cameras much quicker and cheaper to launch.
Called MOIRE, or Membrane Optical Imager for Real-Time Exploitation, the project looks to replace one of the heaviest and most troublesome elements in astronomy. Rather than using enormous mirrors or thick, dense lenses to reflect or refract the light into a collector, MOIRE uses membranes about as thick as kitchen plastic wrap to diffract light onto the satellite’s collector. MOIRE will launch in a compact state, its version of a mirror mounted on the front in the form of folded, concentric “petals” of this membrane. When the mission reaches its destination, these petals will unfold into huge sails, providing a focusing element larger than any mirror could realistically be. A MOIRA satellite launched at 6.5 meters in diameter, roughly the size of the James Webb mirror, could unfurl to a diameter of more than 21 meters.
That’s a big deal, since the diameter of a telescope’s focusing device determines its maximum resolution. If you want to look into the very beginnings of the universe or into its most elusive and subtle elements, you need a big mirror, or at least a mirror analog. If you want to view close-up video of a spot on Earth roughly 35,000 kilometers below, you need a big mirror, too.
These membranes aren’t just physically smaller and lighter
http://www.extremetech.com/extreme/172184-darpas-mirror-killing-membrane-could-change-astronomy-allow-total-global-surveillance
1 replies
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= new reply since forum marked as read
