# 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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#### Presentation Transcript

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?

• 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 _____________

• 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

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