When we use powerful telescopes to look at distant objects in space, we are actually looking back in time A light year is 5,878,625,373,183.6 miles Light travels at a speed of 186,000 miles (or 300,000 km) per second.
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It travels at 186,000 miles per second (300,000 km/sec)
How many miles are in a light year
Just type the number of light years into the box and hit the calculate button. That means the distance a beam of light travels during one year here on earth is about 5.87 trillion miles (9.46 trillion km) A light year (ly) is the distance light travels in one earth year It is 9.4607×10 15 meters or 5.8786×10 12 miles, about 63 astronomical units or about 0.3 parsecs.
This article was most recently revised and updated by erik gregersen. Multiply the speed of light by the number of seconds in a year, and you get the magic number About 9.46 trillion kilometers, or roughly 5.88 trillion miles. Light moves incredibly fast — about 186,000 miles (300,000 kilometers) per second, covering 5.88 trillion miles (9.46 trillion kilometers) per year.