Which of the following best describes the distance between an astronomical unit and a light-year?b007d9619c8c25c7b5db1dcbc64088b4.webm351 KB aAn AU equals the distance between Earth and the Sun; a light-year equals the angle between an object’s apparent positions when viewed from two different locations. bA light-year is useful for measuring objects fewer than 300 light-years from Earth; an AU is useful for measuring objects more than 300 light-years from Earth. cAn AU is calculated by dividing kilometers by 150 million; a light-year is calculated by determining how long it takes an object to travel 150 million AUs. dAn AU is useful for measuring distances within the solar system; a light-year is useful for measuring distances beyond the solar system.

The best description for the distance between an astronomical unit (AU) and a light-year is option d. An AU is useful for measuring distances within the solar system; a light-year is useful for measuring distances beyond the solar system.

Here's why:

An Astronomical Unit (AU) is the average distance between the Earth and the Sun, which is about 93 million miles or 150 million kilometers. Astronomers use the AU to describe distances in the Solar System.

A light-year, on the other hand, is the distance that light travels in one year, which is about 5.88 trillion miles or 9.46 trillion kilometers. This unit is typically used to express astronomical distances outside the Solar System. For example, the nearest star, Proxima Centauri, is about 4.22 light-years away.

So, in essence, AU is used for smaller, intra-solar system distances, while light-years are used for the vast interstellar distances.