Miles or Kilometers
you would measure distances in centimetres, metres and kilo metres.
meters or kilometers.
Because it is a large number, suitable for large distances. Astronomers also like to use the unit Parsec.
Light year is used to measure the stellar distances whereas miles and km is used to measure distance on Earth.
The Astronomical unit is used to measure the large distances in our solar system. It is roughly the average distance between the Earth and the Sun.
To measure the distance of stars you have to measure by light years.
kilometer is the unit of length that can be used to measure large distances . 1 km can measure length of a road.
You can measure very large distances, such as the size of the observable universe or distances between galaxies, using yottameters. This unit of measurement is rarely used in practical applications due to its extremely large scale.
it is light years. And miles are to short.
You can use the kilometer to measure small distances, but it is inconvenient to do so. A kilometer is a unit of measurement for a large distance. It is more accurate and practical to measure small distances using smaller units like the meter or centimeter.
Litres. (L)
AU is not used to measure the distances on earth, because a astronomical unit is a unit of measurement equal to the distance between Earth and Sun. So that's why you cannot use Au for measure the distances on Earth.