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10 surprisingly easy sources of alternative energy

By: Bryan Nelson on Nov. 30, 2009, 11:27 a.m.
Space-based Solar Power

Photo: NASA/Wiki Commons

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Space-based solar power

Since the sun's energy is unaffected in space by the 24-hour cycle of night and day, weather, seasons, or the filtering effect of Earth's atmospheric gases, proposals are underway to put solar panels in orbit and beam the energy down for use on Earth. The technological breakthrough here involves wireless power transmission, which could be performed using microwave beams.