MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY MAURO FERMARIELLO / SCIENCE PHOTO LIBRARY
Hospital rooftop solar panel. Solar panels are arrays of photovoltaic cells which contain silicon, a semiconductor material that absorbs energy from sunlight and converts it into an electrical current. Solar power is a renewable and clean source of energy. At centre left is a telecommunications mast. Photographed at St Mary's Hospital, Lacor, Gulu, Uganda.
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