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by Answerbag Staff on April 23rd, 2010

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How long does light take to travel from the star Alpha Centauri to Earth?

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  • by A. M. Fraser on April 23rd, 2010

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    Light from Alpha Centauri travels 4.3 light years to reach Earth. A light year is a unit of distance that light can travel in one year, which is equal to 9.5 trillion kilometers. Alpha Centauri appears as the third brightest star in the sky. However, Alpha Centauri is actually a three-star system that appears as one bright star to the naked eye.

    Source:

    California Institute of Technology: MSX Image Gallery: Alpha Centauri

    National Earth Science Teachers Association: Windows to the Universe: Alpha Centauri

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