A yard is a unit of length in the imperial and United States customary systems, equal to 3 feet or 36 inches.

A light-year is the distance that light travels in a vacuum in one Julian year (365.25 days).

This is because a light-year represents an incredibly vast distance, while 10,000,000 yards is a relatively small distance in comparison.

No, this specific conversion is rarely used in everyday life. It's primarily relevant in astronomical contexts when dealing with extremely large distances.