Why is a light year better than an astronomical unit?

The answer is: Because the astronomical unit is used to measure a small scale of very large distances between galaxies.

The light-year is a better unit of measurement for intergalactic distances than the astronomical unit. This is because the distances between galaxies are much greater than the distances within the solar system. A light year measures distances of up to 9.4605284 x 10^15 metres, or 63241 astronomical units, making it more suitable for measuring the magnitude of distances between galaxies. This is why the light-year is the most suitable unit for measuring these enormous distances.

A light-year is a unit of measurement used to measure very large and long distances, such as the distances between galaxies. An astronomical unit is a unit of measurement for distances within our solar system, such as the distance between planets. The light-year is better than the astronomical unit for measuring distances between galaxies because the distances between galaxies are much greater than the distances within the solar system. A light year is equal to 9.5 trillion kilometers (or 63241 astronomical units), which is equivalent to every 3.262 years. This makes it an ideal unit for measuring such long distances.