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The light-year is a unit of length used to express astronomical distances. It is about 9.5 trillion kilometres 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.
Kepler-452b is 1,400 light years from Earth - and each light year is 5.88 trillion miles - which means it would take the best part of a millenium-and-a-half to reach it if a spacecraft could travel at the speed of light.