How many miles is a light year?
818301
It's the distance light travels in a year, ie about\n\n5,878,625,373,183.61 statute miles.\n\n(Based on a reference year of exactly 365.25 days (each of exactly 24 hours). This is the value recommended by the International Astronomical Union. It is not a universal standard.)
670041
There are a few measurements that astronomers/cosmologist use to describe the great distances of space.\n\nHere are a few:\n\nLightyear - The distance that light travels in a vacuum in one year, approximately 9.46 trillion (9.46 × 10^12) kilometers or 5.88 trillion (5.88 × 10^12) miles. \n\nAstronomical Unit - A unit of length used in measuring astronomical distances within the solar system equal to the mean distance from Earth to the sun, approximately 150 million kilometers (93 million miles).\n\nParsec - A unit of astronomical length based on the distance from Earth at which stellar parallax is one second of arc and equal to 3.258 light-years, 3.086 × 10^13 kilometers, or 1.918 × 10^13 miles.
1121759
well...we know that the universe is 156 billion light years...that means that it takes 156 billion years for light to get across. (ei) if a star at the very end of the universe exploded, 156 billion years from now, we would see it
81010
Jupiter is way too close to be using light years.\n\nOne "Astronomical Unit" is the earth-sun distance and is approximately eight light minutes. Jupiter orbits at about five A.U. from the sun.  So even when Earth and Jupiter are at their most distant I would still expect that distance to be less than one light hour.
172339
Normally you'd describe shorter distances like that in AU (astronimical units - 1 AU=distance from earth to sun).\nBut - The distance is almost exactly 499 lightseconds - ie \nearth2sun in lightseconds/(days per year*seconds per day).\n499/(365.25*86400)=0.000016 lightyears.
327223
1 lightyear is the distance a beam of light can travel in a vacuum in one year.  Given that the speed of light is roughly 3*(10^8) meters per second, or about 670.6 million miles per hour, then 93 million miles is about 1.58*(10^-5) lightyears.  Another way to look at it, is that it takes about 7.21 minutes for light from the sun to reach earth, and they are roughly 93 million miles apart.
422106
A light year is A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km. More p recisely, one light-year is equal to 9,500,000,000,000 kilometers.\n\nWhy would you want such a big unit of distance? Well, on Earth, a kilometer may be just fine. It is a few hundred kilometers from New York City to Washington, DC; it is a few thousand kilometers from California to Maine. In the Universe, the kilometer is just too small to be useful. For example, the distance to the next nearest big galaxy, the Andromeda Galaxy, is 21 quintillion km. That's 21,000,000,000,000,000,000 km. This is a number so large that it becomes hard to write and hard to interpret. So astronomers use other units of distance.\n\nIn our solar system, we tend to describe distances in terms of the Astronomical Unit (AU). The AU is defined as the average distance between the Earth and the Sun. It is approximately 150 million km (93 million miles). Mercury can be said to be about 1/3 of an AU from the Sun and Pluto averages about 40 AU from the Sun. The AU, however, is not big enough of a unit when we start talking about distances to objects outside our solar system.\n\nFor distances to other parts of the Milky Way Galaxy (or even further), astronomers use units of the light-year or the parsec . The light-year we have already defined. The parsec is equal to 3.3 light-years. Using the light-year, we can say that : \n\nThe Crab supernova remnant is about 4,000 light-years away.\n\nThe Milky Way Galaxy is about 150,000 light-years across.\n\nThe Andromeda Galaxy is 2.3 million light-years away.
662534
About 8.\n\n\nTo clear up any  ambiguity contributed here by some--- The average distance from the Earth to the Sun (or 1 astronomical unit) is 8.317 light minutes. Saying it's "more" or "less" sometimes is stating the obvious-- it's an AVERAGE. Saying it's "usually" different than its average, is nonsensical. \n\nhttp://en.wikipedia.org/wiki/Light_minute
16422
A light year (or light-year), is defined as the distance that a photon would travel, in free space and infinitely distant from any gravitational or magnetic fields, in one Julian year (365.25 days of 86,400 seconds each). Since the speed of light in a vacuum is exactly 299,792,458 m/s by the definition of metre, one light year is exactly equal to 9,460,730,472,580,800 m, or about 5.879 × 10^12 (nearly six trillion) miles.
621324
Around 105 light years, or 3x10^5 km/s * 365 * 24 * 3600s * 105 km, or 993 384 000 000 000 km, or 617 277 076 989 996 mi
585113
About 93,000,000 miles. Also called 1 AU (one Astronomical Unit).
705687
One estimate is 156 billion light years wide.\n\nhttp://www.space.com/scienceastronomy/mystery_monday_040524.html
198251
I think a tousand moon years is way more then 1 light seccond.  Not even having to think about it 4 moon years is about 1 light seccond. 1 moon year has to be more then 25k miles.  The moon goes way faster then that. that would make the moon traveling at 79.714 miles per hour and I just dont believe the moon goes that slow. If it took 1000 moon years to travel 1 light seccond.
8760
None, the two are not related. Earth's rotation is a measure of time and light years are a measure of distance.
687280
Not counting the sun, the closest star to earth is Proxima Centauri, which is about 4.1 light years away from the earth. Light travels at 300 000 km/s so you can now use this to calculate the distant. 4.1 light years x 365 days per one light year x 12 months per 1 year x 30 days per one month, x 24 hours per one day x 60 minutes per one hour x 60 seconds per one minute = 4,654,713,600 seconds. Multiply this figure by 300 000 km/s and you get an answer of 1,396,414,080,000,000 Kilometers.
379410
1 light year = 63 239.6717 Astronomical Units\n\nseriously you can get any conversion done, just go to google and type:\n\n##### (units) in (different units)\n\nfor example typing in "1 light year in AU" gave me back:\n1 light year = 63 239.6717 Astronomical Units.\n\ngo for it.
718580
More than that- There are objects, such as M31 galaxy and supernova, that are millions of light years away that are visible. Take a Andromeda at 2-2.5 million light years. Light goes 186,000 miles in a second..X 60 (minute) X 24 (hour) X 365 (day) = about 98 billion miles in one light year (lets just call it 100 billion).  You can see something 2.5 million light years away, so- you can see things in the night sky that are 100 billion X 2.5 million, or about 250 *quadrillion* miles away.\n\nSo, to answer your question- with the naked eye, you can see things at least 250 quadrillion miles away.  Thats 250 million billion miles.\n\nWow...thanks for asking that question-that was fun and interesting\n\n*edit* by the way, Ronin is wrong-the M31 galaxy (Andromeda) that can be seen with the naked eye is only 2 million light years away- as stated, only supernova are bright enough to see past that