## how long to travel 1 light year

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## Light–year

A light-year, alternatively spelled lightyear, is a large unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (9.46×10^{12} km), or 5.88 trillion miles (5.88×10^{12} mi). As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year (365.25 days). Because it includes the time-measurement word “year”, the term *light-year* is sometimes misinterpreted as a unit of time.

The *light-year* is most often used when expressing distances to stars and other distances on a galactic scale, especially in non-specialist contexts and popular science publications. The unit most commonly used in professional astronomy is the parsec (symbol: pc, about 3.26 light-years) which derives from astrometry; it is the distance at which one astronomical unit subtends an angle of one second of arc.

### 1984

Before 1984, the tropical year (not the Julian year) and a measured (not defined) speed of light were included in the IAU (1964) System of Astronomical Constants, used from 1968 to 1983. The product of Simon Newcomb’s J1900.0 mean tropical year of 31556925.9747 ephemeris seconds and a speed of light of 299792.5 km/s produced a light-year of 9.460530×10^{15} m (rounded to the seven significant digits in the speed of light) found in several modern sources was probably derived from an old source such as C. W. Allen’s 1973 *Astrophysical Quantities* reference work, which was updated in 2000, including the IAU (1976) value cited above (truncated to 10 significant digits).

Other high-precision values are not derived from a coherent IAU system. A value of 9.460536207×10^{15} m found in some modern sources is the product of a mean Gregorian year (365.2425 days or 31556952 s) and the defined speed of light (299792458 m/s). Another value, 9.460528405×10^{15} m, is the product of the J1900.0 mean tropical year and the defined speed of light.

## How long is a light year?

First thing you need to know: a light year is a unit of measurement for distance, not for time! It is a unit of distance that represents the total distance that the beam of light travels in one year moving in a straight line in empty space. It assumed that there no strong magnetic or gravitational fields at this distance. This unit of measurement is used primarily in astronomy to calculate the distance between celestial objects. It would be a bit complicated to use kilometers or miles to measure distances in space given that the distance between certain celestial bodies would require numerous zeros.

The speed of light is 299 792458 meters per second. One Julian year, the year how we measure it, has 365.25 days, or 31,500,000 seconds. The light year is equal to 9,460,730,472,580,800 meters or approximately 9,461 × 1015 meters.

## How many days is a light year in human years?

A light year used to calculate the distance that light travels in a human year. One light year is therefore the same as one human year. Fifty light years is 50 human years. There is no difference in the length of the light year and human year.

A light year just a name used for a unit of distance, not time. When we hear the term light year, we immediately think of time, but a light year has nothing to do with calculating the year. The distances in space are becoming so great that it is impractical to express them in common units of measurement, so we turn to light years.

There is even a unit that is larger than a light year, and that is the parsec. It used to measure the distance between celestial bodies located outside the Solar System. One parsec is equal to 3.3 light years or 31 trillion kilometers.

### HOW FAR IS A LIGHT-YEAR?

The __speed of light__ is constant throughout the universe and is known to high precision. In a vacuum, light travels at 670,616,629 mph (1,079,252,849 km/h). To find the distance of a light-year, you multiply this speed by the number of hours in a year (8,766). The result: One light-year equals 5,878,625,370,000 miles (9.5 trillion km). At first glance, this may seem like an extreme distance, but the enormous scale of the universe dwarfs this length. One estimate puts the diameter of the known universe at __28 billion light-years in diameter__.

## How long would it take us right now to travel 1 light year?

With today’s technology, it would take us approximately 37,200 years to travel the distance of one light year.

For example, if we were to travel at a speed of 58,536 km / h, which is the speed at which the New Horizons rehearsal travels on its way to Pluto, it would take us just under 20,000 years to cross the path of one light year.

If the spacecraft were traveling at the speed at which Helios 2 was traveling, the spacecraft would have traveled one light-year in 4269 light-years.

If a Saturn V rocket that took the man to the moon were to travel, it would take 108,867 years to travel.

If we set out on that journey by the fastest plane, we will need 305975 human years.

### 225 million years

If we were to set out on foot on a journey one light year long. It would take us 225 million years to cross it. At this time, the breaks that you would definitely need along the way not even included.

A snail would cross a distance of one light-year by 83304201370000 years.

I promised I’d blow your mind, and here it is. If you wanted to travel at a constant 1G acceleration and then deceleration to the very edge of the observable Universe. That’s a distance of 13.8 billion light-years away; you would only experience a total of 45 years. Of course, once you got there, you’d have a very different observable Universe. And billions of years of expansion and dark energy would have pushed the galaxies much further away from you.

## How long would it take to travel 4.2 light years

about 6,300 yearsProxima Centauri is 4.2 light-years from Earth, a distance that would take about 6,300 years to travel using current technology.

## Do you age if you travel speed light?

An observer traveling near the speed of light will experience time. With all its aftereffects (boredom, aging, etc.) much more slowly than an observer at rest. That’s why astronaut Scott Kelly aged ever so slightly less over the course of a year in orbit than his twin brother who stayed here on Earth.

## How fast can we currently travel in space?

Nothing can travel faster than 300,000 kilometers per second (186,000 miles per second). Only massless particles, including photons, which make up light, can travel at that speed. It’s impossible to accelerate any material object up to the speed of light because it would take an infinite amount of energy to do so.

## How long would it take to travel to Pluto?

New Horizons launched on January 19, 2006, and it’ll reach Pluto on July 14, 2015. Do a little math and you’ll find that it has taken 9 years, 5 months and 25 days. The Voyager spacecraft did the distance between Earth and Pluto in about 12.5 years, although, neither spacecraft actually flew past Pluto.

## Speed of light and the discovery of lightyear

For scientists to correctly figure out light year. It was important that they have the value of the speed of light. The ancient Greek philosophers disagreed onthe nature of light speed. The philosopher Empedocles thought that light traveled and so must have a rate of travel. Aristotle, in contrast, argued that light was instantaneous.

In the mid-1600s, Galileo Galilei conducted experiments on the speed of light using people placed on hills around a mile apart, holding lanterns. But the distance wasn’t far enough to record the speed of light. Only to conclude that light traveled faster than sound.

In 1676, Danish astronomer Ole Rømer, accidentally came up with a new estimate for the speed of light, while trying to create a reliable astronomical clock for sailors at sea. He used observations of the eclipses of Jupiter’s moon, Io, to estimate the speed of light at about 124,000 miles per second (200,000 km/s).

## Light year vs astronomical unit vs lunar distance vs parsec

Apart from lightyear, there other units as well such as astronomical unit (AU), lunar distance (LD), and parsec (pc) which used to measure the distance between different objects in space. In astronomy, lunar distance, or Earth-moon characteristic distance, is the semi-major axis of the geocentric lunar orbit. It is approximately 400,000 km, which is a quarter of a million miles, or 1.28 light seconds. Lunar distance commonly used to express the distance to near-Earth object encounters.

An astronomical unit (AU) is equal to the mean distance from the center of the Earth to the center of the sun.

Both lunar distance and astronomical units are used to express the distance between objects within our solar system whereas, lightyear and parsec are employed to measure the distances outside our solar system (such as the distance between galaxies).

So, we take these two very large numbers . And multiply them together to see how many miles light can travel in one year. You can tell already that this is going to be huge! That number is 5,865,696,000,000. Working eight hours per day at a rate of one number per second it would take you two hundred thousand years to get to number 5,865,696,000,000! This gets you across the United States two billion times which at our average speed of 60 miles per hour, would take nine trillion years!

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