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