The other, which faces a specialised type of solar cell made of a material called indium gallium arsenide, is sculpted into a structure called a photonic crystal that causes it to emit infra-red radiation selectively at the frequency best absorbed by the cell.

ECONOMIST: Solar power

What is interesting about this star is that it is a former red giant, a so-called "hot B subdwarf".

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It is also called hand, foot and mouth disease because of the red spots that appear on the soles, palms and mouths of victims.

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