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

One light-year is approximately 9.461 trillion meters (9,461,000,000,000 meters).

Light-years are used because the distances to stars and galaxies are so immense that using kilometers or miles would result in extremely large and unwieldy numbers.

Yes, 0.1 light-year (946,100,000,000,000 meters) is an enormous distance, still vast by everyday standards but relatively small on a cosmic scale.