The light year and the astronomical unit
"The closest star to the Sun, Alfa Centauro, is located at a distance of 40,661,440,000 km. But most of the stars are further away, for example; Vega is about 240 billion km, Rigel about 8,600 billion, and the distance in km to a group of stars in the constellation Ursa Major is a six followed by twenty-one zeros".
The distances indicated in the previous text are so great that they become difficult to handle. For this reason, the unit of length called light year was created to express astronomical distances.
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