One light year
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One light year = 1 ly = 6 trillion miles PowerPoint PPT Presentation


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One light year is equal to the distance traveled by light in one year (through empty space). One light year = 1 ly = 6 trillion miles = 9.5 trillion kilometers. Wait a minute! How do we know how far one light year is?.

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One light year = 1 ly = 6 trillion miles

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One light year 1 ly 6 trillion miles

One light year is equal to the distance traveled by light in one year (through empty space).

  • One light year = 1 ly

  • = 6 trillion miles

  • = 9.5 trillion kilometers


One light year 1 ly 6 trillion miles

  • Wait a minute!

  • How do we know how far one light year is?


One light year 1 ly 6 trillion miles

  • QUESTION: How far will you travel in 3 hours

  • if your speed is 50 miles per hour?

  • ANS: ___________________

  • The secret to this calculation is

  • ___________ = _____________ x _____________


  • One light year 1 ly 6 trillion miles

    Calculating a light year

    Using the formula d = vt, with

    v = c = 3.00 x 105 km/s

    t = one year = 3.15 x 107 s

    1 ly = 3.0 x 105 x 3.15 x 107 or


    One light year 1 ly 6 trillion miles

    Some interesting distances:To star nearest the sun….4 lyTo edge of our galaxy.…. 50,000 lyTo nearest galaxy .......…. 2,000,000 ly


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