Because it would be impractical (very large numbers) to use kilometers, miles, or meters to measure distances in our solar system. This unit of measurement is used as it allows for comparisons to be done with relative ease, and all distances can be standardized. For this same reason when talking about anything outside of the solar system, light-years are used as the distances become drastically larger and too much for AUs to handle.
9.54 astronomical units = 1,427,163,686 kilometers
Jupiter's average distance from the sun is about 5.2 astronomical units (AU).
On average, the Earth is about 384,400 kilometers or 0.00257 astronomical units away from the Moon.
Betelgeuse is 40,473,416.93376 AU' (Astronomical Units) from Earth.
Venus is .72 Au(astronomical units) from the sun
Mercury--0.387 astronomical units Venus--0.723 astronomical units Earth--1.0 astronomical units Mars--1.524 astronomical units Jupiter--5.203 astronomical units Saturn--9.529 astronomical units Uranus--19.19 astronomical units Neptune--30.06 astronomical units Pluto--39.53 astronomical units Please note that these are all mean distances, and the actual distance will vary as to the location of the specific planet in its specific orbit.
29 astronomical units = 4,338,338,250 kilometers.
4 astronomical units = 371,822,485 miles
1.93 astronomical units is 288,723,890 kilometers.
38 astronomical units is about 5,684,719,086 kilometers.
0.82 astronomical units is 122,670,254 kilometers.
39.5 astronomical units equate to about 5,909,115,892 kilometers.
1 light year = 63,240 Astronomical Units
9.5 Astronomical Units = 1.421181 × 1014 centimeters
9.54 astronomical units = 1,427,163,686 kilometers
Mars' average distance from the sun is about 1.52 astronomical units (AU), which is approximately 227.9 million kilometers.
Sedna's average distance from the sun is about 86 Astronomical Units.