A irradiate year is a unit of length, simply as is one inch, a mile or a meter. However it is a very large unit. The is the street that light would travel in one year through a vacuum.

You are watching: How many miles is a light year

Light travels at precisely 299,792,458 meters per 2nd (about 186,282.397 miles every second), so:

1 irradiate year equals 9,460,730,472,600 kilometers.

1 light year equals 5,878,625,373,200 miles.

(The rate of light is exact but an earth year varies.)

For comparison:

~ earth is 0.000015812 irradiate years from the sun.

~ among the more quickly objects human being have ever sent into space, the Voyager I room probe, is presently leaving the solar mechanism at 17.1 kilometers every second. At that speed it would certainly take 17,532 years to travel one light year that distance.

~ The closest star to our sun is Proxima Centauri in ~ 4.2 irradiate years away.

~ our galaxy, the Milky Way, is roughly 100,000 light years in diameter.

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How deserve to the speed of light be measured exactly?

In 1983, the meter was redefined in the worldwide System of systems as the distance traveled by light in 1⁄299,792,458 of a second. Together a result, the numerical value of the speed of light in meter per second is currently fixed exactly by the meaning of the meter.

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There room 5,878,625,373,184 mile in a light year

"...1 irradiate year = 5.87849981 × 10<^>12 miles ..."

= 5.87849981e12 miles

Source(s): SFEJust walk to google.com and type in "1 lightyear in miles" and it will provide you her awaited answer.

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3 secs using a find engine online and I discovered this:

One light-year is equal to:

- exactly 9,460,730,472,580.8 kilometres (about 9.5 Pm)

- specifically 31,557,600 light-seconds

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