Astronomical Units (AU) are most useful in describing the distance from a planet to its sun. For just about any other purpose they're either too long (distances on a planet's surface) or too short (distances between stars) to be of much practical use.
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All that I know is that Au is gold, AND AU (capitals) is ASTRONOMICAL UNITS. AU is used for SPACE and means 1 AU is the distance between Earth and the Sun. That is around 149.6-150 MILLION KM. To measure the size of a galaxy, I recommend 'light years'.
2 OE is (Observed Explosion) and -4 would have to be the distance inside the Earth because AU is the measurement distance from outside to outside. Not inside to inside. It could also mean (Obvious Extinction)
SI units is what we use in the United States for the common unit of measurement for matter.
what kind of measurement to use when finding the area of a 2d shape
metric
you will use cm because it is useful then the other types of measurement