The earth is 1 AU (explained below) Mars is 1.5 AU Units Uranius is 19.2 AUs.
The closest one to the 1/10 the distance from the sun to itself is Mars.
An AU unit is used to measure the distances within our solar system. 1 AU is taken to be the distance from the Earth to the Sun. It is a quick way of describing distance without using 6 or 7 zeros.
