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Astronomers normally use parsecs to define distance on a galactic scale. The definition of a parsec is quite difficult to visualise if you are not familiar with terms such as parallax and arcsecond. (The word parsec is derived from these terms; parallax arcsecond).

In contrast to this, it is easy to grasp the concept of a light year. It is the distance that light travels [in a vacuum] in one [Julian] year. This is why popular science articles tend to express distances in light years.

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