The distance to the star Alpha Centauri has been measured to be 1.3 parsec (pc).

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We know that 3.3 light years (ly) = 1.0 pc. Calculate the distance to the star Alpha Centauri in light years. Express your result with the appropriate number of significant figures.

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Explanation & Answer

You can simply multiply these numbers together since it's just a scaling factor:

Distance = 1.3 x 3.3 ly = 4.39ly.

An "appropriate" number of significant figures would be 2, since you have 2sf in your original data. So the answer should be 4.3ly (to 2 significant figures).

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