Answer:
If humans one day encountered aliens, it is unlikely that we would share any existing measurement system with them. Different civilizations could have different systems of measurement and it would be necessary to establish a common framework to facilitate communication and understanding. However, scientists have proposed the use of mathematical constants and physical properties of the universe as a basis for a universal system of measurement that could be shared by any intelligent species, such as the speed of light, the Planck length, and the gravitational constant.