Which distance measurement is approximately 93 million miles?

• A. Light year
• B. Astronomical Unit
• C. Parsec
• D. Lunar distance

Answer: (B)

The distance unit being tested is the one used for measuring distances within the Solar System—the average distance from the Earth to the Sun. This is about 93 million miles (roughly 150 million kilometers). That specific value is what defines the astronomical unit.

A light year is vastly larger, since it measures how far light travels in a year (about 5.88 trillion miles). A parsec is even larger, about 3.26 light-years. The lunar distance, the distance from Earth to the Moon, is only about 238,900 miles, much smaller. So the measurement around 93 million miles fits the astronomical unit.