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3 June, 11:36

The New Horizons probe that passed by Pluto during July 2015 is one of the fastest spacecraft ever assembled. It was moving at about 14 km/s when it went by Pluto. If it maintained this speed, how long would it take New Horizons to reach the nearest star, Proxima Centauri, which is about 4.3 light-years away? (Note: It isn't headed in that direction, but you can pretend that it is.)

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  1. 3 June, 12:02
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    2.91 x 10¹² sec

    Explanation:

    d = distance of nearest star, Proxima Centauri = 4.3 ly = 4.3 x 9.46 x 10¹⁵ m

    v = speed of new horizon probe = 14 km/hr = 14000 m/s

    t = time taken for the new horizon probe to reach nearest star, Proxima Centauri = ?

    Using the equation

    d = v t

    Inserting the values given

    4.3 x 9.46 x 10¹⁵ = (14000) t

    t = 2.91 x 10¹² sec
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