Physical Constant
A physical constant is a quantity that is generally believed to be both universal in nature and constant in time. These constants are important in space and astronautical engineering as they provide a basis for understanding the behavior of the universe and developing mathematical models for space missions. Examples of physical constants include the speed of light, the gravitational constant, and Planck's constant. These constants are used in a variety of calculations, such as determining the trajectory of a spacecraft or the energy output of a star. The values of physical constants are determined through experimental measurements and are refined over time as new data becomes available. They are often expressed in units of the International System of Units (SI) and are used in a wide range of scientific disciplines.
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