A light-year is the distance that light travels in a vacuum in one Julian year (365.25 days). It's used to measure astronomical distances.

0.1 light-year is equal to approximately 587,879,284,975.7417 miles.

Astronomers use light-years because the distances to stars and galaxies are so enormous that using miles would result in incredibly large and unmanageable numbers.

With current technology, traveling 0.1 light-year (over 587 billion miles) is far beyond our capabilities within a human lifetime due to the immense distance involved.