Melting Rock With Solar Energy
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Focused sunlight from a 22 square feet lens can produce temperatures of 6,330 °F (3,500 °C). There is no know substance on earth it cannot melt!

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The BBC "Bang Goes The Theory" team visits the Solar Furnace Research Facility in Southern France and witnesses the incredible power generated by highly concentrated sunlight. Despite having travelled 93 million miles, the energy of the sun can even melt rock.
Wikipedia: A solar furnace is a structure used to harness the rays of the sun in order to produce high temperatures. This is achieved using a curved mirror that acts as a parabolic reflector, concentrating light onto a focal point. The temperature at the focal point may reach 3,500 °C (6,330 °F), and this heat can be used to generate electricity, melt steel, make hydrogen fuel or nanomaterials.   Also see: Melting Steel with Sunlight
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