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Hectometer or hectometre is a measurement of distance. It is equal to 100 meters. It is a uncommonly used unit of length in the metric system. Plural name is hectometers.
The light-year is a unit of length used to express astronomical distances. It is about 9.5 quadrillion metres or 5.9 trillion miles. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). Because it includes the word "year", the term light-year is sometimes misinterpreted as a unit of time.