SI
SI stands for the International System of Units, which is the modern form of the metric system. It is the world's most widely used system of measurement, and is based on seven base units: the meter (length), kilogram (mass), second (time), ampere (electric current), kelvin (temperature), mole (amount of substance), and candela (luminous intensity). In space and astronautical engineering, the SI system is used extensively for measuring physical quantities such as distance, velocity, acceleration, mass, and time. It is particularly important for space missions, where precise measurements are critical for navigation, communication, and scientific research.
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