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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 YearsConversion table | ||
|---|---|---|
| 1 ly | = 5.2147244094365E+18 agate [typography] (agate) | ⇛ |
| 1 ly | = 1.5933564396121E+16 alens (aln) | ⇛ |
| 1 ly | = 9.461E+25 angstroms (Å) | ⇛ |
| 1 ly | = 63242.878763782 astronomical unit (au) | ⇛ |
| 1 ly | = 9.461E+33 attometers (am) | ⇛ |
| 1 ly | = 1.1174409448819E+18 barleycorns (bcorn) | ⇛ |
| 1 ly | = 9.461E+27 bicrons (μμ) | ⇛ |
| 1 ly | = 1.1757585699515E+14 blocks (bl) | ⇛ |
| 1 ly | = 1.7878705990623E+26 bohr radius (Bohr) | ⇛ |
| 1 ly | = 51052674747893 cable length uk (cbl[UK]) | ⇛ |
| 1 ly | = 43111147564888 cable length us (cbl[US]) | ⇛ |
| 1 ly | = 3.7248031496063E+19 calibers (cal) | ⇛ |
| 1 ly | = 3.7248031496063E+19 centiinch (cin) | ⇛ |
| 1 ly | = 9.461E+17 centimeters (cm) | ⇛ |
| 1 ly | = 4.7030342798059E+14 chains (ch) | ⇛ |
| 1 ly | = 2.0693350831146E+16 cubits (cbt) | ⇛ |
| 1 ly | = 946100000000000 decameters (dam) | ⇛ |
| 1 ly | = 9.461E+16 decimeters (dm) | ⇛ |
| 1 ly | = 2.5164093106857E+19 didot points (didot point) | ⇛ |
| 1 ly | = 4.9664041994751E+17 digits (digit) | ⇛ |
| 1 ly | = 236525000 earth circumference (Ec) | ⇛ |
| 1 ly | = 24612254.879007 earth to moon distance (EM d) | ⇛ |
| 1 ly | = 8.2773403324584E+15 ells (eel) | ⇛ |
| 1 ly | = 2.243262719283E+18 ems (EM) | ⇛ |
| 1 ly | = 0.009461 exameters (Em) | ⇛ |
| 1 ly | = 5.1733377077865E+15 fathoms (fath) | ⇛ |
| 1 ly | = 3.1040026246719E+16 feet (ft) | ⇛ |
| 1 ly | = 9.461E+30 femtometers (fm) | ⇛ |
| 1 ly | = 9.461E+30 fermi (fermi) | ⇛ |
| 1 ly | = 8.2773403324584E+16 finger cloth (finer) | ⇛ |
| 1 ly | = 4.2569178852643E+17 fingerbreadth (fb) | ⇛ |
| 1 ly | = 3.0120980579433E+16 fods (fod) | ⇛ |
| 1 ly | = 1.0346675415573E+14 football field length [US] (fbf[US]) | ⇛ |
| 1 ly | = 47030342798059 furlongs (fur) | ⇛ |
| 1 ly | = 9461000 gigameters (Gm) | ⇛ |
| 1 ly | = 3.0717532467532E+14 greek plethron (pleth) | ⇛ |
| 1 ly | = 51140540540541 greek stadion (std) | ⇛ |
| 1 ly | = 9.3120078740157E+16 hands (h) | ⇛ |
| 1 ly | = 94610000000000 hectometers (hm) | ⇛ |
| 1 ly | = 9.461E+20 himetrics (hiMetric) | ⇛ |
| 1 ly | = 3.9420833333333E+15 horse length (hl) | ⇛ |
| 1 ly | = 4.9887058357428E+15 hvats (hvat) | ⇛ |
| 1 ly | = 3.7248031496063E+17 inches (in) | ⇛ |
| 1 ly | = 9461000000000 kilometers (km) | ⇛ |
| 1 ly | = 0.00030657809462087 kiloparsecs (kpc) | ⇛ |
| 1 ly | = 365.28957528958 light days (ld) | ⇛ |
| 1 ly | = 8768.3039851715 light hours (lh) | ⇛ |
| 1 ly | = 525903.27959978 light minutes (lmin) | ⇛ |
| 1 ly | = 12.174752284133 light months (lm) | ⇛ |
| 1 ly | = 31557705.136758 light seconds (ls) | ⇛ |
| 1 ly | = 1 light years (ly) | ⇛ |
| 1 ly | = 4.5052380952381E+18 lines (l) | ⇛ |
| 1 ly | = 4.7030248737328E+16 links (li) | ⇛ |
| 1 ly | = 24612254.879007 lunar distance (LD) | ⇛ |
| 1 ly | = 9461000000 megameters (Mm) | ⇛ |
| 1 ly | = 9461000000000000 meters (m) | ⇛ |
| 1 ly | = 3.1536666666667E+16 metric foot (mf) | ⇛ |
| 1 ly | = 3.7248031496063E+23 microinches (μin) | ⇛ |
| 1 ly | = 9.461E+21 micrometers (μm) | ⇛ |
| 1 ly | = 9.461E+27 micromicrons (μμm) | ⇛ |
| 1 ly | = 5878792849757.4 miles (mi) | ⇛ |
| 1 ly | = 9.461E+18 millimeters (mm) | ⇛ |
| 1 ly | = 3.7248031496063E+20 mils (mil) | ⇛ |
| 1 ly | = 946100000000 myriameters (Mym) | ⇛ |
| 1 ly | = 1.6554680664917E+17 nails cloth (nail) | ⇛ |
| 1 ly | = 9.461E+24 nanometers (nm) | ⇛ |
| 1 ly | = 1702843772498.2 nautical leagues (Nl) | ⇛ |
| 1 ly | = 5108531317494.6 nautical miles (NM) | ⇛ |
| 1 ly | = 1.2416010498688E+16 paces (pace) | ⇛ |
| 1 ly | = 1.2416010498688E+17 palms (palm) | ⇛ |
| 1 ly | = 0.30661012857433 parsecs (pc) | ⇛ |
| 1 ly | = 1.8812137119224E+15 perch (perch) | ⇛ |
| 1 ly | = 9.461 petameters (Pm) | ⇛ |
| 1 ly | = 2.2348818915235E+18 picas (p) | ⇛ |
| 1 ly | = 9.461E+27 picometers (pm) | ⇛ |
| 1 ly | = 3.575811474118E+19 pixels (PX) | ⇛ |
| 1 ly | = 5.913125E+50 planck length (pl) | ⇛ |
| 1 ly | = 2.6818565783581E+19 points (pt) | ⇛ |
| 1 ly | = 1.8812137119224E+15 poles (pole) | ⇛ |
| 1 ly | = 2.1284589426322E+17 rack unit (ru) | ⇛ |
| 1 ly | = 2.2348821713237E+18 rems (rem) | ⇛ |
| 1 ly | = 1.8812137119224E+15 rods (rd) | ⇛ |
| 1 ly | = 2.6650704225352E+14 roman actus (actus) | ⇛ |
| 1 ly | = 1.552001312336E+15 ropes (rope) | ⇛ |
| 1 ly | = 946100000000 scandinavian miles (mil[Scandinavian]) | ⇛ |
| 1 ly | = 0.063241978609626 siriometer (sir) | ⇛ |
| 1 ly | = 4.1386701662292E+16 spans (span) | ⇛ |
| 1 ly | = 9461 terameters (Tm) | ⇛ |
| 1 ly | = 3.7248031496063E+20 thou (th) | ⇛ |
| 1 ly | = 5.3636827484551E+20 twips (twip) | ⇛ |
| 1 ly | = 1.0924942263279E+16 varas [Argentina] (vr[Argentina]) | ⇛ |
| 1 ly | = 1.1287259648537E+16 varas [California] (vr[California]) | ⇛ |
| 1 ly | = 1.0950231481481E+16 varas [Latin America] (vr[Latin]) | ⇛ |
| 1 ly | = 1.1289706689578E+16 varas [Mexico] (vr[Mexico]) | ⇛ |
| 1 ly | = 1.1318339514296E+16 varas [Spanish] (vr[Spanish]) | ⇛ |
| 1 ly | = 1.1174365455254E+16 varas [Texas] (vr[Texas]) | ⇛ |
| 1 ly | = 8868578927634 versts (vst) | ⇛ |
| 1 ly | = 9.4420780755366E+28 x unit (xu) | ⇛ |
| 1 ly | = 1.0346675415573E+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 | = 3.7248031496063E+17 zolls (zoll) | ⇛ |