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What is a light year? How long does it take for light to reach the Earth from the Sun?

  • Science -

    A light year is the distance it takes a beam of light to travel in a year.

    The speed of light is 2.99 x 10^8 m/s.
    Distance from sun to Earth: 150 000 000 Km
    *remember to change km to m
    use equation: t=d/v
    t=150 000 000 000m/2.99 x 10^8 m/s
    t=501sec = 8.35 min

    **I rounded the distance and the speed of light. Use values you think are correct - ie your textbook. i beleive i may be off by 0.05 min.

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