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"100 light years" is a distance; specifically, the distance light travels in 100 years.

The distance is roughly equal to 587,845,000,000,000 miles. (rounded)

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13y ago
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14y ago

It takes 4.22 years. That star is Proxima Centauri, one of the three stars of the Alpha Centauri system. It is 4.22 light years away, which by definition means that it takes 4.22 years for light to travel from it to the Earth. The Alpha and Beta components of this triple star system are a little farther away at this time, 4.37 light years.
Unless, of course, you include our own yellow dwarf star (Sol) which is only eight and a half light minutes away.

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14y ago

One light-year. Light travels about 186,000 miles per second, or 300,000 km per second, so the calculation would be fairly simple;

186000 * 60 * 60 * 24 * 365.24

Did you know that Google is a calculator? It is. I copied that equation into Google and got the following answer:

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lenpollock

Lvl 16
1y ago

The nearest star is the Sun , and a photon of light takes about 8 minutes to reach the Earth.

The next nearest star is 'Alpha- Centuri' and a photon of light takes about 4 0 5 years to reach Earth.

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16y ago

One light year is equal to about Ten Trillion Kilometers; you can multiply the rest out.

(Addition to answer: Putting it in terms of miles or kilometers is not very practical though. A better unit of distance to use might be the Parsec. One Parsec is about 30 trillion kilometers. 100,000 light years is about 30,700 Parsecs... in other words a very, very long way.

Our Milky Way galaxy is thought to be about 100,000 LY across. I haven't done the math for myself but I remember reading that to cross our galaxy at a speed of 100 km/hr would take something like 1.7 trillion years.) 100,000 x 365.25 x 24 x 60 x 60 x speed of light - i.e. quite a distance.

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7y ago

A light-year is a measure of DISTANCE, not time. One light year is the distance that light would travel in one year. Light travels at approximately 186,000 miles per second, or 300,000 kilometers per second.

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11y ago

On average throughout the year, about 8minutes 19seconds , because of

the slight variation in the sun-Earth distance during the year.

"150 million kilometers" = 8minutes 20.3seconds at light speed in vacuum

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12y ago

The light of a star 10,000 light-years away takes 10,000 years to get here.

A light-year is the distance that light travels in one year. It's a pretty long distance. Light travels at about 186,000 miles per SECOND, or 300,000 kilometers per SECOND. There are 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, and 365.24 days per year. Multiply all those numbers together.

We use light-years to measure the distance between different stars. Within the solar system, we typically measure things in Astronomical Units, where the distance between the Earth and the Sun is one AU. For comparison, this is 500 light-SECONDS.

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15y ago

The most distant object visible to the naked eye is the Andromeda Galaxy at about 2.5 million light years. In theory, there should be no limit other than the physical size of the universe provided the object is bright enough.

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13y ago

The term light year is a measure of distance, so this star is 100 light years away, assuming it hasn't moved further away or gotten closer in the 100 years it took for its light to reach earth.

A light year is approximately 9.4605284 × 1015 meters, so a 100 light years would be a hundred times that.

That's approximately 0.946 quadrillion kilometers.

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Q: How far does a light year travel in a year?
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Related questions

How far can light travel in the year in a vacuum?

It can travel about 5.86 trillion miles in one year. This is a light year.


The light year is measured by?

how far u can travel at the speed of light in a year


What is a light year and why do scientist use it?

A light year is a measure of how far light can travel in one year. It is a phenomenal distance, and is used to describe how far away stars are from us.


How far does light travel in a year calculated in meters?

Light travels approximately 9,460,706,958,078,329 meters in one year.


How far can you travel in 1 light year?

Your question seems to suggest that you think a "light year"is a length of time. It's not.It's a distance ... the distance light travels in a year.The distance is about 5,878,450,000,000 miles.I cannot travel nearly that far in one year.


How far does a light year travel?

A "Light year" is a distance. It's the distance light travels in one year, in vacuum.5,878,450,000,000 miles (rounded)


How far in Light years can a Pulsar travel?

As far as light can travel


What is meant by light year is how far light travel in one?

It is the distance travelled by light in one year at a speed of 186,000 miles per second


How much days is in a light year?

A light year is commonly thought of as time, like a year. Really, it is a measure of distance. It is how far light can travel in a year, which is about 6 trillion miles.


How far does light travel a 1000 year?

It travels approx 9.46 trillion kilometres.


How long is 14 lightyears?

A 'light-year' is a distance calculated by how far light can travel in one standard year. A 'light-minute' is how far light can travel in one minute. Earth is about 8 light-minutes (93,000,000 miles) from the Sun. 14 light-years in space is going to be about 84 trillion miles, a huuuuge distance!


How far does a radio wave travel in one year?

One light year, which is 9,500,000,000,000km, or 9.5 trillion kilometers.