How long is a lightyear?
488777
A light year is a measurement of distance, not time.  It's the distance light travels in a year.  For example it takes light about 8 minutes to get from the Sun to the Earth.  Alpha Centauri (the next nearest star) is 4 light years away.\n\nA light year is 9.4605284 × 10^15 meters (10^15 means 10 to the 15th power).  Basically, it's REALLY far and only good for measuring huge distances in space.
271207
1 light year = 9.46x10^15 meters\n1 meter = 39.37 inches\n\nSo set it up as fractions until you get the units you want.  You know you want inches on top, so start with those.\n\n39.37inches/1meter * 9.46x10^15meter/1 light year\n\nThe meters cancel out and you get 3.72x10^17 inches per light year
383249
The Hubble Space Telescope can see out to a distance of several billions of light-years. A light-year is the distance that light travels in 1 year. Since light has a speed of 186,000 miles per second (light can travel about 7 times around the entire earth in 1 second!), light travels about 5,865,696,000,000 miles in just one year. You can attach 9 more zeros to the end of this to get 1 billion light-years and another one for 10 billion light-years. The farthest that Hubble has seen so far is about 10-15 billion light-years away. The farthest area looked at is called the Hubble Deep Field.
44713
The light-year is a measure of distance, not time. It is the total distance that a beam of light, moving in a straight line, travels in one year.
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
158836
The Milky Way galaxy, our galaxy, is 80-100 thousand light years in diameter, and about 3000 light years thick.\n\nA light year is the distance light travels in one year, so it is a measure of distance and not time.  One light year equals about 5,878,499,810,000 miles.
868940
5,878,504,662,190.31854 miles or one light year.
176611
Time standing still at the speed of light is theoretical.  Consider, however, it takes nearly nine minutes for light to travel here from the sun.  Therefore, if something travelling at the speed of light experiences no aging, it's purely relative.
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.
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.
616855
The sun is approx 98 million miles away, light travels 186,282.397 miles per second. So we would know ( and die) about 8.768 minutes later
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First we have to distinguish between the "observable" ("known") universe and the absolute (all) universe. We can only speculate about the size of the entire universe, but for the observable universe most scientists have agreed that it's 13.7-billion light years in size.
488135
A little over 4.35 light years.
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16 min approx by light\n250,000 hours by jet\n2 million hours approx by fast car\n80 million hours by foot\n\n150 Tm from earth (150 million km)
374871
We're about two-thirds of the way from the center, and that is twenty to thirty thousand light years; so the diameter would be sixty to ninety thousand light years.
224869
one light year = 9.4605284 × 10^15 meters \n  (go to google and type meters in one light year in the search box)
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.