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A light-year (abbreviation: ly), sometimes referred to incorrectly as a light year, is a unit of length used informally to express astronomical distances. It is approximately 9 trillion kilometers or 6 trillion miles. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). Because it includes the 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 and popular science publications. The unit usually used in professional astrometry is the parsec (symbol: pc, approximately 3.26 light-years; the distance at which one astronomical unit subtends an angle of one second of arc).

Light YearsSymbol/abbreviation: ly

Unit of: LENGTH

LENGTH's base unit: meters (SI Unit)

In relation to the base unit (meters), 1 Light Years = 9461000000000000 meters.

[Conversion table] 1 Light Years (ly) to all length units | ||
---|---|---|

1 ly | = 5.21472440944E+18 agate [typography] (agate) | ⇛ |

1 ly | = 1.59335643961E+16 alens (aln) | ⇛ |

1 ly | = 9.461E+25 angstroms (Å) | ⇛ |

1 ly | = 63242.8787638 astronomical unit (au) | ⇛ |

1 ly | = 9.461E+33 attometers (am) | ⇛ |

1 ly | = 8.01032935399E+13 barleycorns (bcorn) | ⇛ |

1 ly | = 9.461E+27 bicrons (μμ) | ⇛ |

1 ly | = 1.78787059906E+26 bohr radius (Bohr) | ⇛ |

1 ly | = 5.10526747479E+13 cable length uk (cbl[UK]) | ⇛ |

1 ly | = 4.31111475649E+13 cable length us (cbl[US]) | ⇛ |

1 ly | = 3.72480314961E+19 calibers (cal) | ⇛ |

1 ly | = 3.72480314961E+19 centiinch (cin) | ⇛ |

1 ly | = 9.461E+17 centimeters (cm) | ⇛ |

1 ly | = 4.70303427981E+14 chains (ch) | ⇛ |

1 ly | = 2.06933508311E+16 cubits (cbt) | ⇛ |

1 ly | = 946100000000000 decameters (dam) | ⇛ |

1 ly | = 9.461E+16 decimeters (dm) | ⇛ |

1 ly | = 2.51640931069E+19 didot points (didot point) | ⇛ |

1 ly | = 4.96640419948E+17 digits (digit) | ⇛ |

1 ly | = 8.27734033246E+15 ells (eel) | ⇛ |

1 ly | = 2.24326271928E+18 ems (EM) | ⇛ |

1 ly | = 0.009461 exameters (Em) | ⇛ |

1 ly | = 5.17333770779E+15 fathoms (fath) | ⇛ |

1 ly | = 3.10400262467E+16 feet (ft) | ⇛ |

1 ly | = 9.461E+30 femtometers (fm) | ⇛ |

1 ly | = 9.461E+30 fermi (fermi) | ⇛ |

1 ly | = 8.27734033246E+16 finger cloth (finer) | ⇛ |

1 ly | = 4.25691788526E+17 fingerbreadth (fb) | ⇛ |

1 ly | = 3.01209805794E+16 fods (fod) | ⇛ |

1 ly | = 4.70303427981E+13 furlongs (fur) | ⇛ |

1 ly | = 9461000 gigameters (Gm) | ⇛ |

1 ly | = 3.07175324675E+14 greek plethron (pleth) | ⇛ |

1 ly | = 5.11405405405E+13 greek stadion (std) | ⇛ |

1 ly | = 9.31200787402E+16 hands (h) | ⇛ |

1 ly | = 94610000000000 hectometers (hm) | ⇛ |

1 ly | = 9.461E+20 himetrics (hiMetric) | ⇛ |

1 ly | = 4.98870583574E+15 hvats (hvat) | ⇛ |

1 ly | = 3.72480314961E+17 inches (in) | ⇛ |

1 ly | = 9461000000000 kilometers (km) | ⇛ |

1 ly | = 0.000306578094621 kiloparsecs (kpc) | ⇛ |

1 ly | = 365.28957529 light days (ld) | ⇛ |

1 ly | = 8768.30398517 light hours (lh) | ⇛ |

1 ly | = 525903.2796 light minutes (lmin) | ⇛ |

1 ly | = 12.1747522841 light months (lm) | ⇛ |

1 ly | = 31557705.1368 light seconds (ls) | ⇛ |

1 ly | = 1 light years (ly) | ⇛ |

1 ly | = 4.50523809524E+18 lines (l) | ⇛ |

1 ly | = 4.70302487373E+16 links (li) | ⇛ |

1 ly | = 9461000000 megameters (Mm) | ⇛ |

1 ly | = 9461000000000000 meters (m) | ⇛ |

1 ly | = 3.72480314961E+23 microinches (μin) | ⇛ |

1 ly | = 9.461E+21 micrometers (μm) | ⇛ |

1 ly | = 9.461E+27 micromicrons (μμm) | ⇛ |

1 ly | = 5.87879284976E+12 miles (mi) | ⇛ |

1 ly | = 9.461E+18 millimeters (mm) | ⇛ |

1 ly | = 3.72480314961E+20 mils (mil) | ⇛ |

1 ly | = 946100000000 myriameters (Mym) | ⇛ |

1 ly | = 1.65546806649E+17 nails cloth (nail) | ⇛ |

1 ly | = 9.461E+24 nanometers (nm) | ⇛ |

1 ly | = 1.7028437725E+12 nautical leagues (Nl) | ⇛ |

1 ly | = 5.10853131749E+12 nautical miles (NM) | ⇛ |

1 ly | = 1.24160104987E+16 paces (pace) | ⇛ |

1 ly | = 1.24160104987E+17 palms (palm) | ⇛ |

1 ly | = 0.306610128574 parsecs (pc) | ⇛ |

1 ly | = 1.88121371192E+15 perch (perch) | ⇛ |

1 ly | = 9.461 petameters (Pm) | ⇛ |

1 ly | = 2.23488189152E+18 picas (p) | ⇛ |

1 ly | = 9.461E+27 picometers (pm) | ⇛ |

1 ly | = 3.57581147412E+19 pixels (PX) | ⇛ |

1 ly | = 5.913125E+50 planck length (pl) | ⇛ |

1 ly | = 2.68185657836E+19 points (pt) | ⇛ |

1 ly | = 1.88121371192E+15 poles (pole) | ⇛ |

1 ly | = 2.12845894263E+17 rack unit (ru) | ⇛ |

1 ly | = 2.23488217132E+18 rems (rem) | ⇛ |

1 ly | = 1.88121371192E+15 rods (rd) | ⇛ |

1 ly | = 2.66507042254E+14 roman actus (actus) | ⇛ |

1 ly | = 1.55200131234E+15 ropes (rope) | ⇛ |

1 ly | = 946100000000 scandinavian miles (mil[Scandinavian]) | ⇛ |

1 ly | = 4.13867016623E+16 spans (span) | ⇛ |

1 ly | = 9461 terameters (Tm) | ⇛ |

1 ly | = 3.72480314961E+20 thou (th) | ⇛ |

1 ly | = 5.36368274846E+20 twips (twip) | ⇛ |

1 ly | = 1.09249422633E+16 varas [Argentina] (vr[Argentina]) | ⇛ |

1 ly | = 1.12872596485E+16 varas [California] (vr[California]) | ⇛ |

1 ly | = 1.09502314815E+16 varas [Latin America] (vr[Latin]) | ⇛ |

1 ly | = 1.12897066896E+16 varas [Mexico] (vr[Mexico]) | ⇛ |

1 ly | = 1.13183395143E+16 varas [Spanish] (vr[Spanish]) | ⇛ |

1 ly | = 1.11743654553E+16 varas [Texas] (vr[Texas]) | ⇛ |

1 ly | = 8.86857892763E+12 versts (vst) | ⇛ |

1 ly | = 9.44207807554E+28 x unit (xu) | ⇛ |

1 ly | = 1.03466754156E+16 yards (yd) | ⇛ |

1 ly | = 9.461E+39 yoctometers (ym) | ⇛ |

1 ly | = 9.461E-9 yottameters (Ym) | ⇛ |

1 ly | = 9.461E+36 zeptometers (zm) | ⇛ |

1 ly | = 9.461E-6 zettameters (Zm) | ⇛ |

1 ly | = 3.72480314961E+17 zolls (zoll) | ⇛ |