Astronomical Units (AU)
Astronomical Units is used to measure the distances in the Solar System
The scale for measuring distances in the Solar System is:
1 AU = 149 600 000 km
The astronomical unit provides a convenient way to express and relate distances of objects in the solar system and to carry out various astronomical calculations.
When measuring distance in space, e.g. distances between the planets and the sun, it is important to remember that these distances are constantly changing. This is due to the planets orbiting and moving around the sun, all at different speeds.