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Those are really large numbers.
How long is a light year in km. A kilometer or kilometre is a unit of length equal to 1 000 meters or about 0 621 miles. For general reference there are 63 000 astronomical units in one light year and 63 000 inches 160 000 cm in one mile 1 6 km. One light year is about 6 trillion miles 9 trillion km. When we use powerful telescopes to look at distant objects in space we are actually looking back in time.
This wonderful coincidence enables us to bring the light year. Looking back in time. Light travels at a speed of 186 000 miles. On the scale of the universe measuring distances in miles or kilometers.
The light year is a measure of distance not time. To obtain an idea of the size of a light year take the circumference of the earth 24 900 miles lay it out in a straight line multiply the length of the line by 7 5 the. A light year is the distance light travels in one earth year. In february 2017 astronomers detected seven earth sized planets orbiting a single star 40 light years away from earth.
In most of the world it is the most common unit for measuring distance between places. The nearest star is 4 22 light years away. Because it includes the word year the term light year may be. A light year is the distance that light travels in one year.
How can this be. As defined by the international astronomical union iau a light year is the distance that light travels in vacuum in one julian year 365 25 days. It is the total distance that a beam of light moving in a straight line travels in one year. The light year is a unit of length used to express astronomical distances and measures about 9 46 trillion kilometres 9 46 x 10 12 km or 5 88 trillion miles 5 88 x 10 12 mi.
That is a 6 with 12 zeros behind it. The year used by the international astronomical union is 365 25 days. How far is 40 light years. How long is a light year.
Distance light can travel in a vacuum over a period of 365 25 days. Therefore a light year is exactly 9 460 730 472 580 8 kilometers. Therefore a light year is exactly 9 460 730 472 580 8 kilometers. The center of the milky way is about 26 000.
A light year is a standard of measurement used by astronomers to describe huge distances in the universe. 1 light year is 9 460 730 472 5808 x 10 15 meters si unit.
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