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In solar Astronomy the standard unit of measurement for distance is the Astronomical Unit which is...

In solar Astronomy the standard unit of measurement for distance is the Astronomical Unit which is the average distance from the Earth to the Sun ( 1 1.5 10 ) 8 AU =  km . In stellar Astronomy the distances are so large, that the standard units of length are the Light Year (LY) or the Parsec. A light year is the distance traveled by light in one year, know that light travels 300000 km per second in empty space and that 1 year has 365 days, determine:

a. The distance to Alpha Centaury C in kilometers, the closest star to our solar system which is a distance of 4.26 light years

b. Determine the same distance in AU

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Answer #1

a) 1 LY =9.461e+12 km

Alpha Centaury is at a distance 4.26 LY= 4.0303e+13 =41.32 trillion km

b) 1 LY = 63241.1 au

distance to Alpha Centaury = 269407 au

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