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## What is a Light Year?

A light year is a unit of DISTANCE. It is NOT a unit of time.

It is the distance traveled by light in a vacuum in one earth year.

We know that Light travels at a speed of 3x10

^{8}meters/sec.Therefore, in 1 year, light can travel 3x10

^{8}x 365 days x 60 mins x 60 secs = 9461000000000000 meters = 9.46 petameters.Similarly, one light year is equivalent to 5.879 x 10

^{12}miles , 9.451 x 10^{12}kms This is roughly 6 trillion miles or 9.5 trillion kilometers.The abbreviation for light year is 'ly'

Light years are used to measure astronomical distances. Interstellar distances are so huge that miles and kilometers are very small units to represent length/distance for space objects.

1 light year is equal to 365.25 light days, 8766 light hours, 525600 light minutes and 31536000 light seconds.

Light days, Light hours, Light minutes and Light seconds are also units of distance. They indicate distance travelled by light in a day, in an hour, in a min and in a sec respectively

## Light years to Miles and Miles to Light years

### What is 1 light year in miles?

To convert light year to miles, multiply light year by 5.879 x 10

^{12}

mile = 5.879 x 10^{12} * light year

One Light Year is equal to 5.879 Trillion miles,

### How many miles to a light year?

To convert miles to light year, divide miles by 5.879 x 10

^{12}

light year = miles / 5.879 x 10^{12}

1 mile = 1.70108e-13 light year = 0.000000000000170108 light year

## Light Year to Km and Km to Light years

### What is 1 light year in km?

To convert light years to kilometers, multiply light years by 9.461 x 10

^{12}

km = 9.451 x 10^{12} * light year

### How many Kilometer is a light year?

To convert kilometer to light years, divide kilometers by 9.451 x 10

^{12}

light year (ly) = km * 9.451 x 10^{12}

1 Kilometer = 1.057e-13 light year = 0.0000000000001057 light year

## Light years to Meter and Meter to Light years

### What is 1 light year in meters (1 light year to m)?

To convert light year to meters, multiply light year by 9.461 x 10

^{15}

meters = 9.461 x 10 ^{15} * ly

### How many Meter is a light year?

To convert meter to light year, divide meter by 9.461x10

^{15}

light year = meter / 9.461 x 10^{15}

A meter is therefore 1.057e-16 of a light year or 0.0000000000000001057 of a light year

## Light year to AU and AU to Light years

### How many Light years to Astronomical Units?

To find out how many light years is an AU, multiply light years by 63241.07

au = 63241.07 * light year

### How many Astronomical Units to Light Years?

To convert Au to light year, divide Au by 63241.07

light year (ly) = au / 63241.07

A au is 1.58125E-05 light year, 0.0000158125 light year

## Light years to Parsec and Parsec to Light years

### How many Light years in a Parsec?

To convert Parsec to light year, multiply Parsec by 3.26

Light year = Parsec * 3.26

### How many Parsec in a light year?

To convert light year to parsec, divide light year by 3.26

Parsec = light year / 3.26156

## Light years to Light Days, Light Hours, Light Minutes and Light Seconds

### How many Light years to Light Days?

To convert Light Years to Light Days, multiply light years by 365.25

Light Days = Light Years * 365.35

To convert Light Days to Light Years, divide light years by 365.25

Light Years = Light Days / 365.35

### How many Light Years to Light Hours?

To convert Light Years to Light Hours, multiply light hours by 8766

Light Hours = Light Years * 8766

To convert Light Hours to Light Years, divide light hours by 8766

Light Years = Light Hours / 8766

### How many Light Years to Light Minutes?

To convert Light Years to Light Minutes, multiply light Minutes by 525600

Light Minutes = Light Years * 525600

To convert Light Minutes to Light Years, divide light Minutes by 525600

Light Years = Light Minutes / 525600

### How many Light Years to Light Seconds?

To convert Light Years to Light Seconds, multiply light Seconds by 31536000

Light Seconds = Light Years * 31536000

To convert Light Seconds to Light Years, divide light Seconds by 31536000

Light Years = Light Seconds / 31536000

## Light Years from Earth

Space Object | Distance from Earth (km) | Distance from Earth (miles) | How many light years away? |
---|---|---|---|

Sun | 1.5 Million kms | 9.32 Million miles | 8 light mins, 0.00001582002493716235 light years |

Mercury | 5.8 Million kms | 3.6 Million miles | 3 light mins, 0.00000612388 light years |

Venus | 1.08 Million kms | 6.71 Million miles | 6 light mins, 0.000011397222266557821 light years |

Mars | 2.28 Million kms | 1.42 Million miles | 13 light mins, 0.000024155306893301653 light years |

Jupiter | 7.78 Million kms | 4.834 Million miles | 43 light mins, 0.00008233217279125351 light years |

Saturn | 1.43 Billion kms | 8.886 Million miles | 1.3 light hours, 0.0001505453985955772 light years |

Uranus | 2.87 Billion kms | 1.783 Billion miles | 2.7 light hours, 0.0003027918751413869 light years |

Neptune | 4.5 Billion kms | 2.7961 Billion miles | 4.2 light hours, 0.00047460074811487044 light years |

Pluto/ Kuiper belt | 5.9 Billion kms | 3.67 Billion miles | 5.5 light hours, 0.000628 light years |

Milky Way (our Galaxy) | 9.5 Trillion kms | 5.9 Trillion miles | 100,000 light years |

Andromeda Galaxy (nearest Galaxy) | 1 Trillion kms | 6.21 Trillion miles | 2,500,000 light years |

Proxima Centauri (nearest star) | 7.5 Trillion kms | 4.66 Trillion miles | 1541 light days, 4.22 light years |

Alpha Centauri (other nearest star) | 4.0208 Trillion kms | 2.5 Trillion miles | 1595 light days, 4.367 light years |

Gn-z11 (oldest galaxy) | 1.34 Hextillion kms | 8.33 Hextillion miles | 13,500,000,000 light years |

Polaris (North Star ) | 4.068 Quintillion kms | 2.53 Quintillion miles | 400 light years |

Sirius (brightest star) | 8.146 Trillion kms | 5 Trillion miles | 8.6 light-years |

Oldest Star (Earendel) | 1.5 Million kms | 93205 miles | 28,000,000,000 light years |

## Light Years Conversion Table

Light Years | AU | Parsecs | Miles | Kilometer | Meters |
---|---|---|---|---|---|

1 light year | 63240 au | 0.306560392 parsecs | 5.879e+12, 5.879 Trillion miles | 9.461e+12, 9.461 Trillion kms | 9.461e+15, 9.461 Quadrillion meters |

2 light years | 126480 au | 0.613120785 parsecs | 1.1758e+13, 1.1758 Trillion miles | 1.8922e+13, 1.8922 Trillion kms | 1.8922e+16, 1.8922 Quadrillion meters |

4 light years | 252960 au | 1.22624157 parsecs | 2.3516e+13, 2.3516 Trillion miles | 3.7844e+13, 3.7844 Trillion kms | 3.7844e+16, 3.7844 Quadrillion meters |

5 light years | 316200 au | 1.532801962 parsecs | 2.9395e+13, 2.9395 Trillion miles | 4.7305e+13, 4.7305 Trillion kms | 4.7305e+16, 4.7305 Quadrillion meters |

7 light years | 442680 au | 2.145922747 parsecs | 4.1153e+13, 4.1153 Trillion miles | 6.6227e+13, 6.6227 Trillion kms | 6.6227e+16, 6.6227 Quadrillion meters |

10 light years | 632400 au | 3.065603924 parsecs | 5.879e+13, 5.879 Trillion miles | 9.461e+13, 9.461 Trillion kms | 9.461e+16, 9.461 Quadrillion meters |

20 light years | 1264800 au | 6.131207848 parsecs | 1.1758e+14, 1.1758 Trillion miles | 1.8922e+14, 1.8922 Trillion kms | 1.8922e+17, 1.8922 Quadrillion meters |

15 light years | 948600 au | 4.598405886 parsecs | 8.8185e+13, 8.8185 Trillion miles | 1.41915e+14, 1.41915 Trillion kms | 1.41915e+17, 1.41915 Quadrillion meters |

25 light years | 1581000 au | 7.66400981 parsecs | 1.46975e+14, 1.46975 Trillion miles | 2.36525e+14, 2.36525 Trillion kms | 2.36525e+17, 2.36525 Quadrillion meters |

30 light years | 1897200 au | 9.196811772 parsecs | 1.7637e+14, 1.7637 Trillion miles | 2.8383e+14, 2.8383 Trillion kms | 2.8383e+17, 2.8383 Quadrillion meters |

40 light years | 2529600 au | 12.2624157 parsecs | 2.3516e+14, 2.3516 Trillion miles | 3.7844e+14, 3.7844 Trillion kms | 3.7844e+17, 3.7844 Quadrillion meters |

50 light years | 3162000 au | 15.32801962 parsecs | 2.9395e+14, 2.9395 Trillion miles | 4.7305e+14, 4.7305 Trillion kms | 4.7305e+17, 4.7305 Quadrillion meters |

100 light years | 6324000 au | 30.65603924 parsecs | 5.879e+14, 5.879 Trillion miles | 9.461e+14, 9.461 Trillion kms | 9.461e+17, 9.461 Quadrillion meters |

200 light years | 12648000 au | 61.31207848 parsecs | 1.1758e+15, 1.1758 Quadrillion miles | 1.8922e+15, 1.8922 Quadrillion kms | 1.8922e+18, 1.8922 Quintillion meters |

300 light years | 18972000 au | 91.96811772 parsecs | 1.7637e+15, 1.7637 Quadrillion miles | 2.8383e+15, 2.8383 Quadrillion kms | 2.8383e+18, 2.8383 Quintillion meters |

500 light years | 31620000 au | 153.2801962 parsecs | 2.9395e+15, 2.9395 Quadrillion miles | 4.7305e+15, 4.7305 Quadrillion kms | 4.7305e+18, 4.7305 Quintillion meters |

1000 light years | 63240000 au | 306.5603924 parsecs | 5.879e+15, 5.879 Quadrillion miles | 9.461e+15, 9.461 Quadrillion kms | 9.461e+18, 9.461 Quintillion meters |

3000 light years | 189720000 au | 919.6811772 parsecs | 1.7637e+16, 1.7637 Quadrillion miles | 2.8383e+16, 2.8383 Quadrillion kms | 2.8383e+19, 2.8383 Quintillion meters |

## Frequently Asked Questions on Light Year Conversion

AU or Astronomical unit is smaller than Light year

A Light year 63241 times bigger than AU

AU is the distance between Earth and Sun and this is used as the baseline reference for comparison.

AU is used to refer distances within our solar system

1 light year is equal to 365.25 light days

Light days is also a unit of distance

1 light year is 1 earth year

A light-year is the distance light travels in one Earth year.

Light takes 8.3 minutes from sun to earth.

8.3 light minutes is equal to 8.3/(24*60*365) = 0.0000158 light years

This is also equal to 1 AU.

A light year in seconds is equal to 365 days * 24 hours * 60 min * 60 sec = 31536000 secs

A Parsec is 3.3 times bigger than a Light year

1 pc = ly / 3.3 = 0.3 * ly

Parsec, a shortened form of "Parallax of one second", is used for indicating distances outside the solar system