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sammie

  • 5 years ago

astronomers use a light year to measure distance. light year is distance light travels in a year. speed of light is 300,000 km/sec. How long is 1 light year in kilometers?

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  1. anonymous
    • 5 years ago
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    all right, looks like you need to figure out how many seconds are in a year

  2. anonymous
    • 5 years ago
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    so, 60 seconds in 1 minute, 60 minutes in 1 hour, 24 hours in 1 day, ~365 days in 1 year...

  3. anonymous
    • 5 years ago
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    60*60*24*365

  4. anonymous
    • 5 years ago
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    is how many seconds there, now if light travels 300,000km in 1 second, then light will travel x km in 60*60*24*365 seconds

  5. Sammie
    • 5 years ago
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    thanks for your help!

  6. Sammie
    • 5 years ago
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    on that on do i need to multiply the seconds part by 300,000?

  7. anonymous
    • 5 years ago
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    so you have 300,000km/sec * x sec to obtain only km

  8. anonymous
    • 5 years ago
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    so yes

  9. Sammie
    • 5 years ago
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    then that will give me my km?

  10. Sammie
    • 5 years ago
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    I have another question too. using the last question, the nearest star to the earth is 4.34 light years from earth. how far is that in km?

  11. anonymous
    • 5 years ago
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    ok so you know how many km are in 1 light year

  12. anonymous
    • 5 years ago
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    you just found that with 300,000 * (60*60*24*365)

  13. anonymous
    • 5 years ago
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    so you a found value with km/light year

  14. anonymous
    • 5 years ago
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    so you can multiply a value like (x light years) * ( y km/light year ) and obtain only km, the units, light years, cancel out

  15. Sammie
    • 5 years ago
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    okay i think i finally am starting to get it

  16. anonymous
    • 5 years ago
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    nice

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