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Astronomical distance measurement Every branch of science has its own measurement units. The units of distance measurement are used as per the requirement in every branch of science. For example, a material scientist will measure at most microns (10 - 6 m), at the same time on atomic physicist atstrogram (10 - 10 m), an atom physicist firmi (10 - 15 m) will measure. We know that the standard SI unit meter (m) for measurement in distance, but this unit is not easy to use in every branch of science. Measuring the diameter of an atom in meters or kilometers would be cumbersome. Therefore selection of units is necessary according to study and use. So, what unit is used for measuring distance in astronomy? In this article we will learn about the astronomical unit - au, light year (light year-ly) and parsec. Distance Measurement and Units Unlike the quantum systems that the Universe is extremely vast. So huge that kilometer is very small unit. So astronomers created a new unit syste...