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1 .This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.
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2 .A cloudy day can really dim the promise of solar energy.
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3 .But out in orbit, a collector could constantly harvest the sun's photons.
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4 .That's the idea being explored at the U.S.Naval Research Laboratory.
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5 .And they have a prototype.
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6 .One side of the experimental module is covered in a photovoltaic panel that converts sunlight into electricity.
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7 .In the middle sit electronic circuits that convert the electricity to radio waves.
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8 .The other side has an antenna to beam the energy down to Earth, where it's converted back to electricity.
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9 .The Navy module works well in a vacuum chamber that mimics the empty cold of space.
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10 .In the test set-up, high-powered xenon lamps stand in for concentrated sunlight.
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11 .Of course, getting a working instrument into space is an expensive proposition.
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12 .To cut costs, an orbiting solar array would probably have to be assembled in space, mostly likely by robots that don't even exist yet.
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13 .And some people have qualms about concentrated radio frequency or microwave beams cutting down through the atmosphere to ground-based receivers.
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14 .But given the persistence of this idea, and the desperate need for clean energy, maybe space-based solar will have its day in the sun.
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15 .Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.
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