Radio astronomy installation comprising at least one radio telescope (2) carrying at its upper end at least one reflector (3, 4) and at least one sensor (5), the installation comprising a device for cooling the at least one sensor (5) and at least one electric member (9, 10) powered by a source (11) of electricity, the cooling device comprising a source (6) of liquefied hydrogen and a thermally insulated circuit for transferring liquefied hydrogen from the source (6) to the at least one sensor (5), the transfer circuit comprising a liquid supply pipe (7) having an upstream end connected to the source (6) and a downstream end in heat exchange with the at least one a sensor (5), the source of electricity comprising a fuel cell (11), the transfer circuit comprising a hydrogen recovery line (8) having thermally exchanged the at least one sensor (5), the driving (8) to recover ation being connected to an inlet of the fuel cell (11) for supplying as fuel to the fuel cell (11) at least a portion of the heat-exchanged hydrogen at least one sensor (5)
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