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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. 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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  1. 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

  2. Wait a minute! • How do we know how far one light year is?

  3. 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 _____________

  4. 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

  5. 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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