This summary information can be used to get a feel for astronomical units and distances.
Astronomical distances vary by many orders of magnitude.
The units used to measure the distances are tailored to the distances being measured, just as we use feet to measure our houses and miles to measure our cities here on Earth. An AU, or Astronomical Unit, is the distance from the Earth to the Sun or about 93 million miles. It is a convenient unit of measure for things in and around the solar system. It is a convenient unit of measure for nearby stars. Even this unit is small once one begins to talk about the distances to the galaxies.