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Distance to Nearest Star

There are several stars in the sky some of them are seen from the earth by the naked eye or some can be seen only using the high power telescope. But still there are stars in the sky which are not even seen using the high power telescope because they are very far away from the earth. As the distance of the star from the center of the earth decrease then its visibility from the earth surface by naked eyes increases. The star which is nearest to the earth center is our sun.

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Distance to Closest Star

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There are other several stars which are close to our solar system but he star which is the nearest star of our solar system is the Alpha Centauri and it is located outside our solar system and it is about 4.3 ly distance away from our earth.

Calculation of the distance of Alpha Centauri from our solar system:

We know        

1 AU = 1.5 x 1011 meters

But  1 ly = 9.46 x 1015 meters

Thus  1 AU / 1 ly = 1.5 x 1011 / 9.46 x 1015

= 0.1585 x 10-4

Hence 1 AU = 15.85 x 10-6 ly

Or  1 ly = 6.3 x 104 AU

Thus distance of the Alpha Centauri from the earth is

4.3 ly = 4.3 x 6.3 x 104 AU

= 27.09 x 104 AU

Thus in terms of the distance of the nearest star i.e. sun the Alpha Centauri is very far away from the earth.

As per the discussion on distance to nearest star, we found that Alpha Centauri is the nearest star as per the calculation made on calculating the distance of distant objects in space in terms of light year.

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