It has a mass of 30 kg (66 lb) and its diameter, together with the equipment mounted on it, is about 60 cm (24 in). Dimensions: Curiosity has a mass of 899 kg (1,982 lb) which includes 80 kg (180 lb) of scientific instruments. Communication from and to Curiosity depends on internationally agreed house information communications protocols as defined by the Consultative Committee for Space Data Systems.