The SI unit for length is metre; but we can use in this case the multiple kilometre; 1 km = 1 000 m.
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A stellar unit refers to a unit of distance used in astronomy to measure the distance between stars. It is typically equivalent to the mean distance between stars within a galaxy, which can vary depending on the galaxy being observed.
Meters or kilometers, depending on the distance.
One "Astronomical Unit" is (more or less) the average distance between the Sun and Earth.
An AU is the average distance between the Earth and the Sun, approximately 93 million miles. It is used as a convenient unit for measuring distances within our solar system.
The metric unit used for measuring distance between your eyes is typically centimeters (cm) or millimeters (mm). This measurement is important for determining the interpupillary distance, which is the distance between the centers of your pupils. It is commonly used in optometry for fitting eyeglasses.