The average distance from the sun to the Earth is equal to one __ orbital period parsec astronomical unit light-year

## Step 1<br />The problem is asking for the term that represents the average distance from the sun to the Earth. This distance is a standard unit of measurement in astronomy.<br /><br />## Step 2<br />The term "orbital period" refers to the time it takes for a planet to complete one orbit around the sun. This term does not represent a distance, so it is not the correct answer.<br /><br />## Step 3<br />A "parsec" is a unit of length used in astronomy, but it is not the standard unit for measuring the distance from the sun to the Earth.<br /><br />## Step 4<br />A "light-year" is a unit of distance used in astronomy, but it is not the standard unit for measuring the distance from the sun to the Earth.<br /><br />## Step 5<br />An "astronomical unit" (AU) is the standard unit of measurement for the average distance from the sun to the Earth. It is defined as the average distance from the Earth to the Sun, which is approximately 93 million miles or 150 million kilometers.