In kilometers.
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Light year is exactly 9,460,730,472,580.8 km long. This is speed of light (exactly 299,792,458 m/s by definition of meter), times year which is 365.25 days of 24*3600 s.
Thus, 365.25*24*3600 s* 299,792,458 m/s = 9,460,730,472,580,800 m = 9,460,730,472,580. 8 km
Roughly, this is 10^13 km (10^16 m), or more precisely 9,46 * 10^12 km
Thus, 365.25*24*3600 s* 299,792,458 m/s = 9,460,730,472,580,800 m = 9,460,730,472,580. 8 km
Roughly, this is 10^13 km (10^16 m), or more precisely 9,46 * 10^12 km
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The speed of light can be defined by observing the Jupiter's satellite when they're transits and this is observed in two different earth position and they got it about 3x10^5 km/s (rounded).
A light year is the time that a light beam passed for a year. We can count :
a year=365.25 days x 24 hours x 3600 secs = 3.2 x 10^7 secs
So a light year is 3.2x10^7 secs x 3x10^5 km/s = 9.6x10^12 km
So, that's it. You can count it more accurately by including more digits after comma.
A light year is the time that a light beam passed for a year. We can count :
a year=365.25 days x 24 hours x 3600 secs = 3.2 x 10^7 secs
So a light year is 3.2x10^7 secs x 3x10^5 km/s = 9.6x10^12 km
So, that's it. You can count it more accurately by including more digits after comma.
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1 light years = 9.460528405¹² kilometers or 5.878499814¹² miles
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http://www.grc.nasa.gov/WWW/k-12/Numbers/Math/Mathematical_Thinking/how_long_is_a_light_year.htm
This website says that a light year is almost 6 trillion miles long.
This website says that a light year is almost 6 trillion miles long.
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A light year is equal to just under 10 trillion kilometres.
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9.461E12 km.
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